Use the Dockerfile from the main branch

There is no way to change the Dockerfile in a tag. We need to
use the Dockerfile in the main branch. So even if we're buildin
the image for a stable version, we need to check out the main branch.

The Dockerfile will take care of checking out the proper tags.

Signed-off-by: Gabriel Adrian Samfira <gsamfira@cloudbasesolutions.com>

.github/workflows/build-and-push.yml

@@ -26,7 +26,6 @@ jobs:
         - name: "Checkout"
           uses: actions/checkout@v4
           with:
-            ref: ${{ inputs.ref }}
             path: src/github.com/cloudbase/garm
             fetch-depth: 0
 

Dockerfile

@@ -19,7 +19,7 @@ RUN cd /build/garm/cmd/garm-cli \
       -tags osusergo,netgo,sqlite_omit_load_extension \
       -ldflags "-linkmode external -extldflags '-static' -s -w -X github.com/cloudbase/garm/util/appdefaults.Version=$(git describe --tags --match='v[0-9]*' --dirty --always)" \
       . && upx /bin/garm-cli
-RUN set -e; \
+RUN set -ex; \
     mkdir -p /opt/garm/providers.d; \
     for repo in \
       cloudbase/garm-provider-azure \