a.c

#include <stdio.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <glib.h>

int main()
{
    printf("\033[35m");

    puts("hello");

    struct hostent *e = gethostbyname("dns.google");  // 8.8.8.8 et 8.8.4.4

    printf("e=%p\n", e);
    if (e != NULL)
    {
        printf("name=%s", e->h_name);
        unsigned int i = 0;
        while (e->h_addr_list[i] != NULL)
        {
            printf(" %s", inet_ntoa(*(struct in_addr *)(e->h_addr_list[i])));
            i++;
        }
        printf("\n");
    }

    GList *list = NULL;

    for (int i = 0; i < 10; ++i)
    {
        char *s = malloc(20);
        sprintf(s, "element %d", i + 1);
        list = g_list_append(list, s);
    }

    GList *it = g_list_first(list);
    while (it != NULL)
    {
        printf("%s\n", (char *)it->data);
        it = g_list_next(it);
    }

    printf("\033[0m");
}

demo.sh

#! /bin/sh
set -e

# build image (compile a.c statically)
docker build -q -t z:latest .

# print size in bytes
echo "Docker image size: $(docker inspect z:latest | jq '.[] | .Size')"
docker save z:latest | tar -xO '*/layer.tar' | tar -tv

# run a.out
docker run -t --rm z:latest

Dockerfile

FROM alpine AS builder
RUN apk add gcc musl-dev glib-static glib-dev upx
COPY a.c /
RUN gcc a.c `pkg-config --cflags --libs glib-2.0` -static \
&&  strip a.out \
&&  upx -q a.out || true

FROM scratch
COPY --from=builder /a.out /
ENTRYPOINT ["/a.out"]