chore: rename push build

Signed-off-by: thaddeus kuah <[email protected]>

.github/workflows/build-main.yml

@@ -1,4 +1,4 @@
-name: 'Build and push Docker image (main)'
+name: 'Build - Docker (main)'
 
 on:
     workflow_dispatch:
@@ -71,4 +71,4 @@ jobs:
                   DIGEST: ${{ steps.build-and-push.outputs.digest }}
               # This step uses the identity token to provision an ephemeral certificate
               # against the sigstore community Fulcio instance.
-              run: echo "${TAGS}" | xargs -I {} cosign sign --yes {}@${DIGEST}
+              run: echo "${TAGS}" | xargs -I {} cosign sign --yes {}@${DIGEST}