goreleaser: build docker images

Add building docker images for AMD64 and ARM64 (v8).
To build locally run make dist.
It uses fixed tag `1.0.0-devel` across all snapshot builds.

```
 • docker images
    • building docker image                          image=saucelabs/forwarder:1.0.0-devel-amd64
    • building docker image                          image=saucelabs/forwarder:1.0.0-devel-arm64
    • took: 3s
  • storing release metadata
    • writing                                        file=dist/artifacts.json
    • writing                                        file=dist/metadata.json
```

Fixes #53

.goreleaser.yml

@@ -29,3 +29,26 @@ builds:
 
 checksum:
   name_template: "checksums"
+
+dockers:
+  - image_templates:
+      - "{{ if .IsSnapshot }}saucelabs/{{.ProjectName}}:{{ .Tag }}-amd64{{ else }}saucelabs/{{.ProjectName}}:{{ .Version }}-amd64{{ end }}"
+    use: buildx
+    goos: linux
+    goarch: amd64
+    build_flag_templates:
+      - "--platform=linux/amd64"
+  - image_templates:
+      - "{{ if .IsSnapshot }}saucelabs/{{.ProjectName}}:{{ .Tag }}-arm64v8{{ else }}saucelabs/{{.ProjectName}}:{{ .Version }}-arm64v8{{ end }}"
+    use: buildx
+    goos: linux
+    goarch: arm64
+    goarm: 8
+    build_flag_templates:
+      - "--platform=linux/arm64/v8"
+
+docker_manifests:
+    - name_template: "saucelabs/{{.ProjectName}}:{{ .Version }}"
+      image_templates:
+        - "saucelabs/{{.ProjectName}}:{{ .Tag }}-amd64"
+        - "saucelabs/{{.ProjectName}}:{{ .Tag }}-arm64v8"

Dockerfile

@@ -0,0 +1,11 @@
+FROM ubuntu:22.10
+
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends ca-certificates && \
+    apt-get clean && \
+    apt-get autoremove && \
+    rm -rf /var/lib/apt/lists/*
+
+COPY forwarder /usr/bin/forwarder
+ENTRYPOINT ["/usr/bin/forwarder"]
+CMD ["proxy", "--api-address", ":10000"]

Makefile

@@ -2,8 +2,6 @@
 # Use of this source code is governed by a MIT
 # license that can be found in the LICENSE file.
 
-all: dev
-
 export GOBIN := $(PWD)/bin
 export PATH  := $(GOBIN):$(PATH)
 
@@ -22,12 +20,7 @@ clean:
 	@rm -Rf bin dist *.coverprofile *.dev *.race *.test *.log
 	@go clean -cache -modcache -testcache ./... ||:
 
-.PHONY: dev
-dev: forwarder.race
-	@./forwarder.race run
-
-forwarder.race: .check-go-version $(shell go list -f '{{range .GoFiles}}{{ $$.Dir }}/{{ . }} {{end}}' ./...)
-	@go build -o ./forwarder.race -race ./cmd/forwarder
+### Testing
 
 .PHONY: .check-go-version
 .check-go-version:
@@ -57,6 +50,12 @@ integration-test:
 coverage:
 	@go tool cover -func=coverage.out
 
+### Release
+
+.PHONY: dist
+dist:
+	@GORELEASER_CURRENT_TAG=1.0.0-devel goreleaser --snapshot --rm-dist
+
 .PHONY: doc
 doc:
 	@echo "Open http://localhost:6060/pkg/github.com/saucelabs/forwarder/ in your browser\n"