Bump docker/login-action from 1 to 2

Bumps [docker/login-action](https://github.com/docker/login-action) from 1 to 2.
- [Release notes](https://github.com/docker/login-action/releases)
- [Commits](docker/login-action@v1...v2)

---
updated-dependencies:
- dependency-name: docker/login-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/self-test-multistage-docker-build.yml

@@ -29,7 +29,7 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Auth to GH registry
-        uses: docker/login-action@v1
+        uses: docker/login-action@v2
         with:
           registry: ghcr.io
           username: ${{ github.repository_owner }}
@@ -89,7 +89,7 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Auth to GH registry
-        uses: docker/login-action@v1
+        uses: docker/login-action@v2
         with:
           registry: ghcr.io
           username: ${{ github.repository_owner }}
@@ -119,7 +119,7 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Auth to GH registry
-        uses: docker/login-action@v1
+        uses: docker/login-action@v2
         with:
           registry: ghcr.io
           username: ${{ github.repository_owner }}
@@ -150,7 +150,7 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Auth to GH registry
-        uses: docker/login-action@v1
+        uses: docker/login-action@v2
         with:
           registry: ghcr.io
           username: ${{ github.repository_owner }}