dockerfile: dind target to build docker image for testing

Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>

.github/workflows/ci.yml

@@ -154,3 +154,23 @@ jobs:
         uses: github/codeql-action/upload-sarif@v3
         with:
           sarif_file: ${{ env.DESTDIR }}/govulncheck.out
+
+  build-dind:
+    runs-on: ubuntu-24.04
+    needs:
+      - validate-dco
+    steps:
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+        with:
+          version: ${{ env.SETUP_BUILDX_VERSION }}
+          driver-opts: image=${{ env.SETUP_BUILDKIT_IMAGE }}
+          buildkitd-flags: --debug
+      -
+        name: Build dind image
+        uses: docker/bake-action@v6
+        with:
+          targets: dind
+          set: |
+            *.output=type=cacheonly

Dockerfile

@@ -657,6 +657,15 @@ FROM dev-base AS devcontainer
 COPY --link . .
 COPY --link --from=gopls         /build/ /usr/local/bin/
 
+# usage:
+# > docker buildx bake dind
+# > docker run -d --restart always --privileged --name devdind -p 12375:2375 docker-dind --debug --host=tcp://0.0.0.0:2375 --tlsverify=false
+FROM docker:dind AS dind
+COPY --link --from=dockercli /build/docker /usr/local/bin/
+COPY --link --from=buildx    /buildx /usr/local/libexec/docker/cli-plugins/docker-buildx
+COPY --link --from=compose   /docker-compose /usr/local/libexec/docker/cli-plugins/docker-compose
+COPY --link --from=all       / /usr/local/bin/
+
 # usage:
 # > make shell
 # > SYSTEMD=true make shell

docker-bake.hcl

@@ -164,6 +164,17 @@ target "bin-image-cross" {
   ]
 }
 
+#
+# dind
+#
+
+target "dind" {
+  inherits = ["_common"]
+  target = "dind"
+  tags = ["docker-dind"]
+  output = ["type=docker"]
+}
+
 #
 # dev
 #