Include git info into docker build, show git ref at version (#3829)

* ci: include .git directory into build

* p2p: include git ref into version for user agent, show git commit hash instead of last tag into log

* p2p: do not show anything after version if git commit hash is empty

* fix: user agent typo

.github/workflows/publish-ghcr.yaml.yml

@@ -41,13 +41,12 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
-      - name: Checkout code
-        uses: actions/checkout@v6
-
       - name: Build and push by digest
         id: build
         uses: docker/build-push-action@v6
         with:
+          build-args: |
+            BUILDKIT_CONTEXT_KEEP_GIT_DIR=1
           provenance: false # Disable provenance to avoid unknown/unknown
           sbom: false       # Disable sbom to avoid unknown/unknown
           platforms: ${{ matrix.platform }}