fix(ci/github/agent): fix bash syntax

Author: ayuskauskas

.github/workflows/agent-container.yaml

@@ -53,7 +53,7 @@ jobs:
           apt-get update && apt-get install -y make git jq
           cd agent
           # if this is a tag build, use the tag as the version, otherwise use the sha
-          TAGS="-t ${REGISTRY@L}/${{env.IMAGE_NAME}}/agent:${{ github.sha }}
+          TAGS="-t ${REGISTRY@L}/${{env.IMAGE_NAME}}/agent:${{ github.sha }}"
           case ${{ github.ref_type }} in
             branch)
                 # The last tag + current git sha