Install podman and use podman-login action

.github/workflows/main.yml

@@ -43,12 +43,13 @@ jobs:
           - thrimshim
           - zulip_bots
     steps:
-      - name: Install git
+      - name: Install git & podman
         # the buildah/stable image doesn't include git
         # actions/checkout works without git, but not if you do submodules
         # thus, we install git
+        # we need podman for the podman-login action unfortunately
         run: |
-          sudo dnf install -y git
+          sudo dnf install -y git podman
 
       - name: Check out repo
         uses: actions/checkout@v3
@@ -68,12 +69,11 @@ jobs:
           sudo dnf install -y qemu-user-static
 
       - name: Log into ghcr.io
-        env:
+        uses: redhat-actions/podman-login@v1
+        with:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
-        run: |
-          buildah login "$registry" --username "$username" --password "$password"
 
       - name: Build ${{ matrix.component }}
         # always push