add macos codesigning of opm binary for apple silicon

Signed-off-by: Jordan Keister <[email protected]>

Author: grokspawn

Makefile

@@ -55,6 +55,10 @@ $(CMDS):
 $(OPM): opm_version_flags=-ldflags "-X '$(PKG)/cmd/opm/version.gitCommit=$(GIT_COMMIT)' -X '$(PKG)/cmd/opm/version.opmVersion=$(OPM_VERSION)' -X '$(PKG)/cmd/opm/version.buildDate=$(BUILD_DATE)'"
 $(OPM):
 	$(extra_env) $(GO) build $(opm_version_flags) $(extra_flags) $(TAGS) -o $@ ./cmd/$(notdir $@)
+ifeq ($(shell go env GOARCH),arm64)
+	codesign --sign - --force --preserve-metadata=entitlements,requirements,flags,runtime $(OPM)
+endif
+
 
 .PHONY: build
 build: clean $(CMDS) $(OPM)