add shell

.forgejo/workflows/build.yaml

@@ -9,17 +9,21 @@ jobs:
     steps:
       -
         name: Install buildah
+        shell: sh
         run: |
           apk add buildah
       -
         name: Checkout
+        shell: sh
         uses: actions/checkout@v4
       -
         name: Authenticate with registry
+        shell: sh
         run: |
           echo "${{ secrets.REGISTRY_TOKEN }}" | buildah login ${{ env.REGISTRY }} --username "${{ secrets.REGISTRY_USERNAME }}" --password-stdin
       -
         name: Build and push
+        shell: sh
         run: |
           id
           $GITHUB_WORKSPACE/builder.sh ${{ env.REGISTRY_IMAGE }}