Replace docker/login-action with inline docker login (#543)

Drop dependency on docker/login-action by replacing it with a simple
docker login command. Just reduces our supply chain exposure a bit.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: inahga

.github/workflows/release.yml

@@ -90,11 +90,9 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
       - name: Login to GitHub Container Registry
-        uses: docker/login-action@v3
-        with:
-          registry: ghcr.io
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
+        run: printenv GITHUB_TOKEN | docker login -u "$GITHUB_ACTOR" --password-stdin ghcr.io
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       - name: Build and push ${{ github.repository }}/${{ matrix.app }} for ${{ env.DOCKER_PLATFORMS }}
         uses: docker/build-push-action@v5
         with:
@@ -120,11 +118,9 @@ jobs:
           - windows-latest
     steps:
       - name: Login to GitHub Container Registry
-        uses: docker/login-action@v3
-        with:
-          registry: ghcr.io
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
+        run: printenv GITHUB_TOKEN | docker login -u "$GITHUB_ACTOR" --password-stdin ghcr.io
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       - name: Display pebble version in container image
         run: docker run ${{ env.DOCKER_IMAGE_BASENAME }}/pebble:latest -version
   create-release: