Return a 0 exit code on skip

entrypoint.sh

@@ -16,6 +16,11 @@ NEXT_TAG="$3"
 
 echo ::Executing bumper guard ::debug release_branch=${RELEASE_BRANCH},github_event_path=${GITHUB_EVENT_PATH}
 /bumper guard "${RELEASE_BRANCH}" "${GITHUB_EVENT_PATH}"
+if [ $? -eq 78 ]
+then
+    echo ::debug ::Guard returned a neutral code, stopping the execution.
+    exit 0
+fi
 
 if [ -z "${NEXT_TAG}" ]
 then
@@ -32,4 +37,4 @@ fi
 echo ::debug ::Executing bumper release github_repository=${GITHUB_REPOSITORY},github_sha=${GITHUB_SHA},next_tag=${NEXT_TAG},strategy=${RELEASE_STRATEGY}
 /bumper release --strategy "${RELEASE_STRATEGY}" "${GITHUB_REPOSITORY}" "${GITHUB_SHA}" "${NEXT_TAG}" "${GITHUB_TOKEN}"
 
-echo ::set-output name=tag::${NEXT_TAG}
+echo ::set-output name=tag::${NEXT_TAG}