Sample Python3 + MongoDB DevWorkspace CR which creates a Openshift Dev Spaces workspace

pymongo-fastapi-crud-devworkspace-cr.yaml

apiVersion: workspace.devfile.io/v1alpha2
kind: DevWorkspace
metadata:
  annotations:
    che.eclipse.org/che-editor: che-incubator/che-code/latest
  name: pymongo-fastapi-crud
  namespace: user1-devspaces
  finalizers:
    - rbac.controller.devfile.io
spec:
  contributions:
    - name: ide
      uri: http://devspaces-dashboard.openshift-devspaces.svc.cluster.local:8080/dashboard/api/editors/devfile?che-editor=che-incubator/che-code/latest
  routingClass: che
  started: true
  template:
    attributes:
      controller.devfile.io/devworkspace-config:
        name: devworkspace-config
        namespace: openshift-devspaces
      controller.devfile.io/scc: container-build
      controller.devfile.io/storage-type: per-workspace
    commands:
      - exec:
          commandLine: |
            . ${HOME}/.venv/bin/activate
            python hello-world.py
          component: tools
          group:
            kind: run
          label: Run the Hello World Program
          workingDir: '${PROJECT_SOURCE}'
        id: run-hello-world
      - exec:
          commandLine: 'mongosh mongodb://localhost --username root'
          component: tools
          group:
            kind: run
          label: Start mongosh-cli
          workingDir: '${PROJECT_SOURCE}'
        id: mongosh-cli
      - exec:
          commandLine: |
            . ${HOME}/.venv/bin/activate
            python -m uvicorn main:app --reload
          component: tools
          group:
            kind: run
          label: Start pymongo-fastapi-crud app
          workingDir: '${PROJECT_SOURCE}/pymongo-fastapi-crud'
        id: pymongo-fastapi-app
      - exec:
          commandLine: |
            # init venv
            python -m venv ${HOME}/.venv && . ${HOME}/.venv/bin/activate
            python -m pip install -r requirements.txt
            # setup git default config
            git config --local credential.helper store
            git config --local pull.rebase true
            git config --local fetch.prune true
            git config --local diff.colorMoved zebra
            # create app env file
            ENV_FILE=${PROJECT_SOURCE}/pymongo-fastapi-crud/.env
            if [ ! -f $ENV_FILE ]; then
              echo 'ATLAS_URI=mongodb://root:mongo123!@localhost:27017' > $ENV_FILE
              echo 'DB_NAME=pymongo_tutorial' >> $ENV_FILE
            fi
          component: tools
          label: '99: setup environment'
          workingDir: '${PROJECT_SOURCE}'
        id: init-env
    components:
      - container:
          cpuRequest: '1'
          env:
            - name: KUBEDOCK_ENABLED
              value: 'true'
            - name: KUBEDOCK_TIMEOUT
              value: '30'
            - name: EXHORT_PYTHON_VIRTUAL_ENV
              value: 'true'
            - name: VSCODE_DEFAULT_WORKSPACE
              value: '${PROJECT_SOURCE}/.code-workspace'
          memoryRequest: 1Gi
          sourceMapping: /projects
          cpuLimit: '2'
          volumeMounts:
            - name: venv
              path: /home/user/.venv
          memoryLimit: 2Gi
          image: 'quay.io/redhat_na_ssa/python3-developer-image:latest'
          mountSources: true
        name: tools
      - name: venv
        volume:
          size: 1G
      - container:
          endpoints:
            - exposure: public
              name: mongodb
              protocol: tcp
              targetPort: 27017
          env:
            - name: MONGO_INITDB_ROOT_USERNAME
              value: root
            - name: MONGO_INITDB_ROOT_PASSWORD
              value: mongo123!
          image: 'docker.io/mongodb/mongodb-community-server:6.0.1-ubi8'
          memoryLimit: 300Mi
          sourceMapping: /projects
          volumeMounts:
            - name: mongodbdata
              path: /data/db
        name: mongodb
      - name: mongodbdata
        volume:
          size: 1G
    events:
      postStart:
        - init-env
    projects:
      - name: python3-mongodb-devfile
        git:
          remotes:
            origin: https://github.com/redhat-na-ssa/python3-mongodb-devfile.git

Reference: https://access.redhat.com/documentation/en-us/red_hat_openshift_dev_spaces/3.16/html-single/user_guide/index#managing-workspaces-with-apis-creating-workspaces

Remember you need also to create and annotate the user's namespace properly before. Here is an user namespace sample definition.

kind: Namespace
apiVersion: v1
metadata:
  name: user1-devspaces # <-- change username here
  labels:
    app.kubernetes.io/component: workspaces-namespace
    app.kubernetes.io/part-of: che.eclipse.org
    kubernetes.io/metadata.name: user1-devspaces # <-- change username here
  annotations:
    che.eclipse.org/username: user1 # <-- change username here
    openshift.io/description: 'DevSpaces workspace for user1'
spec: {}