add test for force_rebuild (#448)

see also [forgejo/runner #406](https://code.forgejo.org/forgejo/runner/pulls/406)

Reviewed-on: https://code.forgejo.org/forgejo/end-to-end/pulls/448
Reviewed-by: earl-warren <earl-warren@noreply.code.forgejo.org>
Co-authored-by: gratux <gratux@noreply.code.forgejo.org>
Co-committed-by: gratux <gratux@noreply.code.forgejo.org>

actions/example-force-rebuild/.forgejo/local-docker-action/Dockerfile

@@ -0,0 +1,5 @@
+FROM debian:bookworm-slim
+COPY entrypoint.sh /run/entrypoint.sh
+# if we rebuild, we should notice this file change
+COPY input.txt /run/input.txt
+ENTRYPOINT [ "/run/entrypoint.sh" ]

actions/example-force-rebuild/.forgejo/local-docker-action/action.yml

@@ -0,0 +1,6 @@
+name: local docker action
+description: local docker action, build depends on "input.txt"
+
+runs:
+  using: 'docker'
+  image: 'Dockerfile'

actions/example-force-rebuild/.forgejo/local-docker-action/entrypoint.sh

@@ -0,0 +1,3 @@
+#! /usr/bin/env bash
+set -x
+exit "$(< /run/input.txt)"

actions/example-force-rebuild/.forgejo/local-docker-action/input.txt

@@ -0,0 +1 @@
+this file will be filled by the test

actions/example-force-rebuild/.forgejo/workflows/test.yml

@@ -0,0 +1,10 @@
+---
+on:
+  push:
+jobs:
+  test:
+    runs-on: docker
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - uses: ./.forgejo/local-docker-action