chore: add GitHub Actions

.github/workflows/docker.yml

@@ -0,0 +1,30 @@
+name: Build Docker Image
+on: [ push ]
+jobs:
+  image:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Login to Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: git.0x7f.app
+          username: ${{ secrets.CONTAINER_USERNAME }}
+          password: ${{ secrets.CONTAINER_PASSWORD }}
+      - name: Write Sentry DSN
+        run: echo -n "$SENTRY_DSN" > dsn.txt
+        env:
+          SENTRY_DSN: ${{ secrets.SENTRY_DSN }}
+      - name: Build Base Image
+        if: startsWith(github.ref, 'refs/tags/')
+        run: ./build_image.sh base
+        env:
+          DOCKER: docker
+      - name: Build Server Image
+        run: ./build_image.sh server
+        env:
+          DOCKER: docker
+      - name: Build Runner Image
+        run: ./build_image.sh runner
+        env:
+          DOCKER: docker