Initial Dockerfile and Pipeline

.forgejo/workflows/main.yml

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+---
+name: Build the Actrunner Container
+
+on: [push]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Git
+        uses: actions/checkout@v3
+      - name: Install Docker
+        run: |
+          apt-get update
+          apt-get install -y docker.io
+      - name: Setup Builder
+        uses: docker/setup-buildx-action@v3
+      - name: Login to Registry
+        uses: docker/login-action@v3
+        with:
+          registry: git.xmda.de
+          username: ${{ vars.REGISTRY_USER }}
+          password: ${{ secrets.REGISTRY_PASS }}
+      - name: Generate timestamp
+        run: echo "TIMESTAMP=$(date +'%s')" >> $GITHUB_ENV
+      - name: Build the Docker image
+        uses: docker/build-push-action@v6
+        with:
+          push: true
+          tags: |
+            git.xmda.de/seiichiro/actrunner:latest
+            git.xmda.de/seiichiro/actrunner:build-${{ env.TIMESTAMP }}

Dockerfile

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+FROM docker.io/library/node:20-bookworm
+RUN apt-get update && apt-get install -y docker.io