ci: pin every action in the jobs that sign

The jobs that hold the OIDC identity run these with registry credentials,
so a retargeted tag upstream must not reach them.

Claude-Session: https://claude.ai/code/session_01A5zMqzaUg1Snur4Yg8xJGa

.github/workflows/container_release_foundationdb.yml

@@ -28,11 +28,11 @@ jobs:
     steps:
       -
         name: Checkout
-        uses: actions/checkout@v7
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
       -
         name: Docker meta
         id: docker_meta
-        uses: docker/metadata-action@v6
+        uses: docker/metadata-action@dc802804100637a589fabce1cb79ff13a1411302 # v6
         with:
           images: |
             chrislusf/seaweedfs
@@ -46,14 +46,14 @@ jobs:
             org.opencontainers.image.vendor=Chris Lu
       -
         name: Set up QEMU
-        uses: docker/setup-qemu-action@v4.2.0
+        uses: docker/setup-qemu-action@96fe6ef7f33517b61c61be40b68a1882f3264fb8 # v4.2.0
       -
         name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v4
+        uses: docker/setup-buildx-action@37fe631027851001ddb9b187196cc803df7f5f0e # v4
       -
         name: Login to Docker Hub
         if: github.event_name != 'pull_request'
-        uses: docker/login-action@v4.6.0
+        uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4.6.0
         with:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
@@ -69,7 +69,7 @@ jobs:
       -
         name: Build
         id: build
-        uses: docker/build-push-action@v7
+        uses: docker/build-push-action@53b7df96c91f9c12dcc8a07bcb9ccacbed38856a # v7
         with:
           context: ./docker
           push: ${{ github.event_name != 'pull_request' }}