Unspecify GitHub Actions' versions

.github/workflows/auto-merge.yml

@@ -21,16 +21,16 @@ jobs:
           echo Hello, this workflow is allowed to specific OWNERS.
 
       # Apply 'approved' label when OWNER left '/approve' comment
-      - uses: actions/checkout@v2.4.0
-      - uses: actions-ecosystem/action-add-labels@v1.1.3
+      - uses: actions/checkout@v2
+      - uses: actions-ecosystem/action-add-labels@v1
         with:
           github_token: ${{ secrets.github_token }}
           labels: |
             approved
 
       # AutoMerging if this PR has MERGE_LABELS: approved, lgtm (not wip, hold)
       - name: automerge-lgtm-approved
-        uses: "pascalgn/automerge-action@v0.14.3"
+        uses: "pascalgn/automerge-action@v0"
         with:
           args: "--trace"
         env:

.github/workflows/build-amd64-container-image.yaml

@@ -29,7 +29,7 @@ jobs:
 
     steps:
       - name: Checkout source code
-        uses: actions/checkout@v2.4.0
+        uses: actions/checkout@v2
 
       - name: Build image
         env:

.github/workflows/make-swagger.yaml

@@ -22,11 +22,11 @@ jobs:
           go-version: ${{ matrix.go-version }}
 
       - name: Checkout source code
-        uses: actions/checkout@v2.4.0
+        uses: actions/checkout@v2
 
       - name: Install swag
         run: |
-          go install github.com/swaggo/swag/cmd/swag@latest
+          go install github.com/swaggo/swag/cmd/swag@v1.7.8
 
       - name: Update Swagger doc
         run: |

.github/workflows/prow-commands.yml

@@ -25,7 +25,7 @@ jobs:
       # Action according to command (by jpmcb/prow-github-actions)  
       - name: Action according to command
         if: ${{ startsWith(github.event.comment.body, '/') }}
-        uses: jpmcb/prow-github-actions@v1.1.3
+        uses: jpmcb/prow-github-actions@v1
         with:
           prow-commands: '/assign 
             /unassign

.github/workflows/publish-multi-arch-container-images.yaml

@@ -38,7 +38,7 @@ jobs:
 
     steps:
       - name: Checkout source code
-        uses: actions/checkout@v2.4.0
+        uses: actions/checkout@v2
 
       - name: Prepare tags
         id: prep
@@ -70,39 +70,39 @@ jobs:
           echo ${GHCR_TAGS}
 
       - name: Set up QEMU
-        uses: docker/setup-qemu-action@v1.2.0
+        uses: docker/setup-qemu-action@v1
         with:
           platforms: all
 
       - name: Set up Docker Buildx
         id: buildx
-        uses: docker/setup-buildx-action@v1.6.0
+        uses: docker/setup-buildx-action@v1
 
       - name: Cache Docker layers
-        uses: actions/cache@v2.1.7
+        uses: actions/cache@v2
         with:
           path: /tmp/.buildx-cache
           key: ${{ runner.os }}-buildx-${{ github.sha }}
           restore-keys: |
             ${{ runner.os }}-buildx-
 
       - name: Login to Docker Hub
-        uses: docker/login-action@v1.12.0
+        uses: docker/login-action@v1
         with:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
 
       # TODO: Create a PAT with `read:packages` and `write:packages` scopes and save it as an Actions secret `CR_PAT`
       - name: Login to GitHub Container Registry
-        uses: docker/login-action@v1.12.0
+        uses: docker/login-action@v1
         with:
           registry: ghcr.io
           username: ${{ github.repository_owner }}
           password: ${{ secrets.CR_PAT }}
 
       - name: Build and publish
         id: docker_build
-        uses: docker/build-push-action@v2.9.0
+        uses: docker/build-push-action@v2
         with:
           builder: ${{ steps.buildx.outputs.name }}
           context: ./