ci: make sure detect-profile works in source dir

.github/actions/detect-profiles/action.yaml

@@ -15,7 +15,15 @@ runs:
       shell: bash
       run: |
         git config --global --add safe.directory "$GITHUB_WORKSPACE"
-        if make emqx-ee --dry-run > /dev/null 2>&1; then
+        if [ -d source ]; then
+          ## source code downloaded
+          cd source
+        fi
+        if [ ! -d .git ]; then
+          echo "Not git dir, $(pwd)"
+          exit 1
+        fi
+        if [ -f 'EMQX_ENTERPRISE' ]; then
           echo "::set-output name=profiles::[\"emqx-ee\"]"
           echo "https://ci%40emqx.io:${{ inputs.ci_git_token }}@github.com" > $HOME/.git-credentials
           git config --global credential.helper store