example docker compose file and test

examples/docker-compose/compose-demo-workflow.yml

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+# Copyright 2023 The Forgejo Authors.
+# SPDX-License-Identifier: MIT
+
+version: "3"
+
+services:
+
+  demo-workflow:
+    image: alpine:3.18
+    links:
+      - forgejo
+    depends_on:
+      runner-register:
+        condition: service_completed_successfully
+    command: >-
+      sh -xc '
+      apk add --quiet git curl jq ;
+      mkdir -p /srv/demo ;
+      cd /srv/demo ;
+      git init --initial-branch=main ;
+      mkdir -p .forgejo/workflows ;
+      echo "{ on: [push], jobs: { test: { runs-on: docker, steps: [ { run: echo All Good } ] } } }" > .forgejo/workflows/demo.yml ;
+      git add . ;
+      git config user.email root@example.com ;
+      git config user.name username ;
+      git commit -m 'demo' ;
+      while : ; do
+        git push --set-upstream --force http://root:admin1234@forgejo:3000/root/test main && break ;
+        sleep 5 ;
+      done ;
+      sha=`git rev-parse HEAD` ;
+      while : ; do
+        curl -sS -f http://forgejo:3000/api/v1/repos/root/test/commits/$$sha/status | jq --raw-output .state | tee status ;
+        grep success status && break ;
+        sleep 5 ;
+      done ;
+      echo DEMO WORKFLOW SUCCESS
+      '