fix: use full branch name for miniflare extension install in CI

GITHUB_HEAD_REF##*/ strips everything up to the last slash, turning
fix/ci-failures into ci-failures which is not a valid branch ref. Use
the full branch name instead. Also add --fail to the curl check so the
step actually fails when the extension is not loaded.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: whummer

.github/workflows/miniflare.yml

@@ -34,16 +34,15 @@ jobs:
           sudo apt-get install -y libvirt-dev
           pip install localstack localstack-ext
 
-          branchName=${GITHUB_HEAD_REF##*/}
-          if [ "$branchName" = "" ]; then branchName=main; fi
+          branchName=${GITHUB_HEAD_REF:-main}
           echo "Installing from branch name $branchName"
           localstack extensions init
-          localstack extensions install "git+https://github.com/localstack/localstack-extensions.git@"$branchName"#egg=localstack-extension-miniflare&subdirectory=miniflare"
+          localstack extensions install "git+https://github.com/localstack/localstack-extensions.git@${branchName}#egg=localstack-extension-miniflare&subdirectory=miniflare"
 
           DEBUG=1 localstack start -d
           localstack wait
           curl http://localhost:4566/_localstack/health
-          curl http://localhost:4566/miniflare/user
+          curl --fail http://localhost:4566/miniflare/user
 
       - name: Run test
         env: