ci: use specific commit tag for github actions

.github/workflows/docker.yml

@@ -11,18 +11,18 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out the repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@2541b1294d2704b0964813337f33b291d3f8596b
 
       - name: Log in to Docker Hub
         if: github.event_name != 'pull_request'
-        uses: docker/login-action@v1
+        uses: docker/login-action@dd4fa0671be5250ee6f50aedf4cb05514abda2c7
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_ACCESS_TOKEN }}
 
       - name: Login to GHCR
         if: github.event_name != 'pull_request'
-        uses: docker/login-action@v1
+        uses: docker/login-action@dd4fa0671be5250ee6f50aedf4cb05514abda2c7
         with:
           registry: ghcr.io
           username: ${{ github.repository_owner }}
@@ -30,7 +30,7 @@ jobs:
 
       - name: Extract metadata (tags, labels) for Docker
         id: meta
-        uses: docker/metadata-action@v3
+        uses: docker/metadata-action@f2a13332ac1ce8c0a71aeac48a150dbb1838ab67
         with:
           images: |
             krateng/maloja
@@ -42,13 +42,13 @@ jobs:
             latest=true
 
       - name: Set up QEMU
-        uses: docker/setup-qemu-action@v1
+        uses: docker/setup-qemu-action@27d0a4f181a40b142cce983c5393082c365d1480
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v1
+        uses: docker/setup-buildx-action@94ab11c41e45d028884a99163086648e898eed25
 
       - name: Cache Docker layers
-        uses: actions/cache@v2
+        uses: actions/cache@48af2dc4a9e8278b89d7fa154b955c30c6aaab09
         with:
           path: /tmp/.buildx-cache
           key: ${{ runner.os }}-buildx-${{ github.sha }}
@@ -56,7 +56,7 @@ jobs:
             ${{ runner.os }}-buildx-
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@v2
+        uses: docker/build-push-action@ac9327eae2b366085ac7f6a2d02df8aa8ead720a
         with:
           context: .
           file: Containerfile
@@ -76,7 +76,7 @@ jobs:
           mv /tmp/.buildx-cache-new /tmp/.buildx-cache
 
       - name: Update Readme and short description
-        uses: peter-evans/dockerhub-description@1cf9afbac3c5d2fdc66416a464c2c38260cb6f8d
+        uses: peter-evans/dockerhub-description@836d7e6aa8f6f32dce26f5a1dd46d3dc24997eae
         continue-on-error: true
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}