Merge pull request kubernetes-sigs#134 from MrHohn/build-template-update

Update go-build-template scaffold to the latest.

Author: MrHohn

.gitignore

@@ -3,4 +3,5 @@
 /.push-*
 /.container-*
 /.dockerfile-*
-/.idea/
+/.licenses*
+/.buildx-initialized

Dockerfile.in

@@ -12,10 +12,26 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM gcr.io/distroless/static:nonroot
+FROM {ARG_FROM}
 
-MAINTAINER Zihong Zheng <[email protected]>
+# When building, we can pass a unique value (e.g. `date +%s`) for this arg,
+# which will force a rebuild from here (by invalidating docker's cache).
+ARG FORCE_REBUILD=0
 
-ADD bin/ARG_ARCH/ARG_BIN /ARG_BIN
+# When building, we can pass a hash of the licenses tree, which docker checks
+# against its cache and can force a rebuild from here.
+ARG HASH_LICENSES=0
 
-ENTRYPOINT ["/ARG_BIN"]
+# Add third-party licenses.
+COPY .licenses/ /LICENSES/
+
+# When building, we can pass a hash of the binary, which docker checks against
+# its cache and can force a rebuild from here.
+ARG HASH_BINARY=0
+
+# Add the platform-specific binary.
+COPY bin/{ARG_OS}_{ARG_ARCH}/{ARG_BIN} /{ARG_BIN}
+
+ENV HOME /
+
+ENTRYPOINT ["/{ARG_BIN}"]