Update other repos when Docker rebuild

.github/workflows/after-build.yml

@@ -0,0 +1,51 @@
+# ----------------------------------------------------------------------------
+# GitHub Actions workflow that causes rebuild of all CGE repos
+# that rely on CGE Docker images.
+# This allows to test that the new CGE (Docker, GitHub code) is compatible
+# with all CGE projects.
+# ----------------------------------------------------------------------------
+
+name: After Build
+
+# Called by other xxx.yml
+on: [workflow_call]
+
+defaults:
+  run:
+    shell: bash
+
+jobs:
+  dispatch-rebuild:
+    name: Dispatch Rebuild To Other Repos
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+
+    # Make https://github.com/castle-engine/castle-engine-docker
+    # rebuild Docker image with the latest CGE snapshot.
+    #
+    # See repository_dispatch docs:
+    # https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#repository_dispatch
+    # https://docs.github.com/en/rest/repos/repos?apiVersion=2022-11-28#create-a-repository-dispatch-event
+    - name: Dispatch updating Docker cge-unstable
+      env:
+        GH_TOKEN: ${{ secrets.GH_TOKEN_DISPATCH_AFTER_UPDATE }}
+      run: |
+        gh api --method POST \
+          -H "Accept: application/vnd.github+json" \
+          -H "X-GitHub-Api-Version: 2022-11-28" \
+          /repos/castle-engine/castle-model-viewer/dispatches \
+          -f "event_type=cge-docker-unstable-changed"  \
+          -F "client_payload[cge_docker_commit_sha]=${{ github.sha }}"
+        gh api --method POST \
+          -H "Accept: application/vnd.github+json" \
+          -H "X-GitHub-Api-Version: 2022-11-28" \
+          /repos/castle-engine/castle-model-viewer-mobile/dispatches \
+          -f "event_type=cge-docker-unstable-changed"  \
+          -F "client_payload[cge_docker_commit_sha]=${{ github.sha }}"
+        gh api --method POST \
+          -H "Accept: application/vnd.github+json" \
+          -H "X-GitHub-Api-Version: 2022-11-28" \
+          /repos/castle-engine/cge-www/dispatches \
+          -f "event_type=cge-docker-unstable-changed"  \
+          -F "client_payload[cge_docker_commit_sha]=${{ github.sha }}"

.github/workflows/update-docker-all.yml

@@ -88,3 +88,8 @@ jobs:
         IFS=$'\n\t'
         source build-common.sh
         do_everything_for_image_unstable
+
+  after_build:
+    name: After Build
+    needs: [build-none, build-stable, build-unstable]
+    uses: ./.github/workflows/after-build.yml

.github/workflows/update-docker-cge-unstable.yml

@@ -43,3 +43,8 @@ jobs:
       # On self-hosted machine, we would do additionally
       # ./remove_unused_docker_images.sh
       # Seems not necessary on GH-hosted machine, as they are cleaned each time.
+
+  after_build:
+    name: After Build
+    needs: build
+    uses: ./.github/workflows/after-build.yml