use go base image

.github/workflows/build_and_test.yml

@@ -13,9 +13,6 @@ jobs:
       fail-fast: false
       matrix:
         go:
-          # Drop support of go 1.17
-          - "1.18"
-          - "1.19"
           - "1.20"
           - "1.21"
     name: run tests with go version ${{ matrix.go }}

.goreleaser.yml

@@ -21,6 +21,7 @@ archives:
 
 kos:
   - repository: abice/go-enum
+    base_image: cgr.dev/chainguard/go # need the go binary for formatting 🔧 purposes 🫤
     tags:
       - "{{.Version}}"
       - latest

.ko.yaml

@@ -0,0 +1,19 @@
+defaultBaseImage: cgr.dev/chainguard/go # For now, we need the go binary in order to format go files.
+defaultPlatforms:
+  - linux/arm64
+  - linux/amd64
+
+builds:
+  - id: go-enum
+    dir: . # default is .
+    main: .
+    flags:
+      - -tags
+      - netgo
+    ldflags:
+      - -s -w
+      - -extldflags "-static"
+      - -X "main.version={{.Env.VERSION}}"
+      - -X "main.commit={{.Env.COMMIT}}"
+      - -X "main.date={{.Env.DATE}}"
+      - -X "main.builtBy={{.Env.BUILT_BY}}"

Makefile

@@ -99,28 +99,26 @@ bin/goveralls: go.sum
 	$(call goinstall,github.com/mattn/goveralls)
 
 # snapshots: snapshots_1.17
-snapshots: snapshots_1.20
+snapshots: snapshots_1.21
 
 snapshots_%: clean
 	echo "##### updating snapshots for golang $* #####"
 	docker run -i -t -w /app -v $(shell pwd):/app --entrypoint /bin/sh golang:$* -c './update-snapshots.sh || true'
 
 .PHONY: ci
-# ci: docker_1.16
-# ci: docker_1.17
-ci: docker_1.18
-ci: docker_1.19
 ci: docker_1.20
+ci: docker_1.21
 
 docker_%:
 	echo "##### testing golang $* #####"
 	docker run -i -t -w /app -v $(shell pwd):/app --entrypoint /bin/sh golang:$* -c 'make clean && make'
 
 .PHONY: pullimages
-pullimages: pullimage_1.17
-pullimages: pullimage_1.18
-pullimages: pullimage_1.19
 pullimages: pullimage_1.20
+pullimages: pullimage_1.21
 
 pullimage_%:
 	docker pull golang:$*
+
+build_docker:
+	KO_DOCKER_REPO=abice/go-enum VERSION=$(GITHUB_REF) COMMIT=$(GITHUB_SHA) DATE=$(DATE) BUILT_BY=$(USER) ko build --bare --local

README.md

@@ -88,6 +88,14 @@ It's not perfect, but I think it's useful.
 
 I took the output of the [Stringer](https://godoc.org/golang.org/x/tools/cmd/stringer) command as the `String()` method, and added a way to parse a string value.
 
+## Docker image
+
+You can now use a docker image directly for running the command if you do not wish to install anything!
+
+```shell
+   docker run -w /app -v $(pwd):/app abice/go-enum:$(GO_ENUM_VERSION)
+```
+
 ## Installation
 
 You can now download a release directly from github and use that for generating your enums! (Thanks to [GoReleaser](https://github.com/goreleaser/goreleaser-action))