go.mk: use as a plain repo instead of a submodule (#575)

We remove the `go.mk` as a submodule and ensure that it is automatically
cloned and kept up to date with make.

.github/actions/build/action.yaml

@@ -6,8 +6,9 @@ runs:
       with:
         fetch-depth: 0
 
-    - run: git submodule update --init --recursive go.mk
+    - run: make go.mk
       shell: bash
+
     - uses: ./go.mk/.github/actions/setup
 
     - uses: ./go.mk/.github/actions/pre-check

.gitignore

@@ -1,4 +1,5 @@
 .git
+/go.mk
 dist
 release
 exo

CHANGELOG.md

@@ -1,5 +1,10 @@
 # Changelog
 
+## Unreleased
+
+### Improvements
+- go.mk: use as a plain repo instead of a submodule #575 
+
 ## 1.76.0
 
 ### Bug Fixes

Makefile

@@ -1,6 +1,39 @@
+GO_MK_REF := v1.0.0
+
+# make go.mk a dependency for all targets
+.EXTRA_PREREQS = go.mk
+
+ifndef MAKE_RESTARTS
+# This section will be processed the first time that make reads this file.
+
+# This causes make to re-read the Makefile and all included
+# makefiles after go.mk has been cloned.
+Makefile:
+	@touch Makefile
+endif
+
+# All files included from go.mk need an associated target or make will error
+# before go.mk can be cloned.
+go.mk/init.mk:
 include go.mk/init.mk
+go.mk/public.mk:
 include go.mk/public.mk
 
+.PHONY: go.mk
+.ONESHELL:
+go.mk:
+	@if [ ! -d "go.mk" ]; then
+		git clone https://github.com/exoscale/go.mk.git
+	fi
+	@cd go.mk
+	@if ! git show-ref --quiet --verify "refs/heads/${GO_MK_REF}"; then
+		git fetch
+	fi
+	@if ! git show-ref --quiet --verify "refs/tags/${GO_MK_REF}"; then
+		git fetch --tags
+	fi
+	git checkout --quiet ${GO_MK_REF}
+
 PROJECT_URL = https://github.com/exoscale/cli
 GO_BIN_OUTPUT_NAME := exo
 OAS_FILE := public-api.json