Here's a Python script that you can use to check and replace the Ubuntu version in a GitHub workflow file for all your repositories.

check_old_version.py

import os
import requests
import base64

# Set your GitHub API token
GITHUB_TOKEN = "GITHUB_TOKEN"

# Set the Ubuntu version you want to replace
old_ubuntu_versions = ["ubuntu-18.04", "ubuntu-20.04"]

# Set the new Ubuntu version you want to use
new_ubuntu_version = "ubuntu-22.04"

# Get a list of all your repositories
headers = {
    "Authorization": f"token {GITHUB_TOKEN}",
    "Accept": "application/vnd.github.v3+json",
}

# Set the organization whose repositories you want to retrieve
ORGANIZATION = "ORGANIZATION"

# Set the base URL for the GitHub API
base_url = "https://api.github.com"

# Set the parameters for the API request
params = {
    "per_page": 100,  # Maximum number of results per page
    "page": 1,  # Start with the first page of results
    "sort": "updated",  # Sort the results by the date they were last updated
}

all_repos = []

# get repos of an organization for all pages
# Loop through all pages of results until no more pages are returned
while True:
    # Send the API request to retrieve the repositories
    response = requests.get(
        f"{base_url}/orgs/{ORGANIZATION}/repos", params=params, headers=headers
    )

    # If the response was successful, add the repositories to the list
    if response.status_code == 200:
        repos = response.json()
        for repo in repos:
            all_repos.append(repo["name"])

        # If there are more pages of results, increase the page number and send another API request
        if "next" in response.links:
            params["page"] += 1
        else:
            break

    # If the response was not successful, print an error message and stop looping
    else:
        print(f"Failed to retrieve repositories: {response.status_code}")
        break

old_repos = []
# Loop through each repository and replace the Ubuntu version in its workflow file
for repo in all_repos:
    # Get the contents of the workflow file
    response = requests.get(
        f"{base_url}/repos/okcredit/{repo}/contents/.github/workflows/deploy.yml",
        headers=headers,
    )
    if response.status_code == 200:
        content = response.json()["content"]
        workflow_file = base64.b64decode(content).decode("utf-8")
        # check if the workflow file contains the old Ubuntu version
        for old_ubuntu_version in old_ubuntu_versions:
            if old_ubuntu_version in workflow_file:
                old_repos.append(
                    {"repo": repo, "old_ubuntu_version": old_ubuntu_version}
                )


for old_ubuntu_version in old_ubuntu_versions:
    # print the list of repositories that contain the old Ubuntu version
    print(f"Repositories with {old_ubuntu_version}:")
    for repo in old_repos:
        if repo["old_ubuntu_version"] == old_ubuntu_version:
            print(repo["repo"])

replace_old_version.py

import os
import requests
import base64

# Set your GitHub API token
GITHUB_TOKEN = "GITHUB_TOKEN"

# Set the Ubuntu version you want to replace
old_ubuntu_versions = ["ubuntu-18.04", "ubuntu-20.04"]

# Set the new Ubuntu version you want to use
new_ubuntu_version = "ubuntu-22.04"

# Get a list of all your repositories
headers = {
    "Authorization": f"token {GITHUB_TOKEN}",
    "Accept": "application/vnd.github.v3+json",
}

# Set the organization whose repositories you want to retrieve
ORGANIZATION = "ORGANIZATION"

# Set the base URL for the GitHub API
base_url = "https://api.github.com"

# Set the parameters for the API request
params = {
    "per_page": 100,  # Maximum number of results per page
    "page": 1,  # Start with the first page of results
    "sort": "updated",  # Sort the results by the date they were last updated
}

all_repos = []

# get repos of an organization for all pages
# Loop through all pages of results until no more pages are returned
while True:
    # Send the API request to retrieve the repositories
    response = requests.get(
        f"{base_url}/orgs/{ORGANIZATION}/repos", params=params, headers=headers
    )

    # If the response was successful, add the repositories to the list
    if response.status_code == 200:
        repos = response.json()
        for repo in repos:
            all_repos.append(repo["name"])

        # If there are more pages of results, increase the page number and send another API request
        if "next" in response.links:
            params["page"] += 1
        else:
            break

    # If the response was not successful, print an error message and stop looping
    else:
        print(f"Failed to retrieve repositories: {response.status_code}")
        break

# Loop through each repository and replace the Ubuntu version in its workflow file
for repo in all_repos:
    # Get the contents of the workflow file
    response = requests.get(
        f"{base_url}/repos/okcredit/{repo}/contents/.github/workflows/deploy.yml",
        headers=headers,
    )
    if response.status_code == 200:
        content = response.json()["content"]
        workflow_file = base64.b64decode(content).decode("utf-8")
        # check if the workflow file contains the old Ubuntu version
        for old_ubuntu_version in old_ubuntu_versions:
            if old_ubuntu_version in workflow_file:
                workflow_file = base64.b64decode(content).decode("utf-8")

                # Replace the old Ubuntu version with the new one
                new_workflow_file = workflow_file.replace(old_ubuntu_version, new_ubuntu_version)

                # Create a branch to make the changes
                branch_name = f"update-ubuntu-version-{new_ubuntu_version}"
                data = {
                    "ref": "refs/heads/main"
                }
                response = requests.post(
                    f"{base_url}/repos/{ORGANIZATION}/{repo}/git/refs",
                    headers=headers,
                    json=data
                )
                if response.status_code == 201:
                    sha = response.json()["object"]["sha"]

                    # Create a new file with the updated contents
                    data = {
                        "message": "Update Ubuntu version in GitHub Actions workflow",
                        "branch": branch_name,
                        "content": base64.b64encode(new_workflow_file.encode("utf-8")).decode("utf-8"),
                        "path": ".github/workflows/main.yml",
                        "sha": sha
                    }
                    response = requests.put(
                        f"{base_url}/repos/{ORGANIZATION}/{repo}/contents/.github/workflows/main.yml",
                        headers=headers,
                        json=data
                    )
                    if response.status_code == 201:
                        print(f"Successfully created new file in {repo}")
                        # Create a pull request for the changes
                        data = {
                            "title": f"Update Ubuntu version to {new_ubuntu_version}",
                            "body": f"This pull request updates the Ubuntu version used in the GitHub Actions workflow from {old_ubuntu_version} to {new_ubuntu_version}.",
                            "head": branch_name,
                            "base": "main"
                        }
                        response = requests.post(
                            f"{base_url}/repos/{ORGANIZATION}/{repo}/pulls",
                            headers=headers,
                            json=data
                        )
                        if response.status_code == 201:
                            print(f"Successfully created pull request for {repo}")
                        else:
                            print(f"Failed to create pull request for {repo}")
                    else:
                        print(f"Failed to create new file in {repo}")
                else:
                    print(f"Failed to create branch in {repo}")