migrate from travis to github actions and remove docker

.github/dependabot.yml

@@ -5,8 +5,3 @@ updates:
   schedule:
     interval: daily
   open-pull-requests-limit: 10
-- package-ecosystem: docker
-  directory: "/"
-  schedule:
-    interval: daily
-  open-pull-requests-limit: 10

.github/workflows/release.yml

@@ -0,0 +1,36 @@
+name: goreleaser
+
+on:
+  push:
+    tags:
+      - '*'
+
+permissions:
+  contents: write
+
+jobs:
+  goreleaser:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      -
+        name: Set up Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.17
+      -
+        name: Run tests
+        run: make test
+      -
+        name: Run GoReleaser
+        uses: goreleaser/goreleaser-action@v2
+        with:
+          distribution: goreleaser
+          version: latest
+          args: release --rm-dist
+        env:
+          GITHUB_TOKEN: ${{ secrets.PUBLIC_REPO_TOKEN }}

.gitignore

@@ -1 +1,2 @@
-/ipcalc
+/ipcalc
+/releases/*

.goreleaser.yml

@@ -0,0 +1,37 @@
+builds:
+  -
+    goos:
+      - linux
+      - darwin
+      - windows
+    goarch:
+      - amd64
+      - arm64
+    ldflags:
+      - -X main.Version={{.Version}}
+checksum:
+  name_template: 'checksums.txt'
+dist: releases
+changelog:
+  sort: asc
+  filters:
+    exclude:
+      - '^docs:'
+      - '^test:'
+release:
+  github:
+    owner: pete911
+    name: ipcalc
+brews:
+  - tap:
+      owner: pete911
+      name: homebrew-tap
+      token: "{{ .Env.GITHUB_TOKEN }}"
+    name: ipcalc
+    homepage: "https://github.com/pete911/ipcalc"
+    description: "IP calculator"
+    folder: Formula
+    install: |
+      bin.install "ipcalc"
+    test: |
+      assert_match /version/, shell_output("#{bin}/ipcalc", 0)

Makefile

@@ -1,5 +1,3 @@
-NAME := ipcalc
-IMAGE := pete911/${NAME}
 VERSION ?= dev
 
 test:
@@ -10,27 +8,6 @@ build: test
 	go build -ldflags "-X main.Version=${VERSION}"
 .PHONY:build
 
-image:
-	docker build --build-arg version=${VERSION} -t ${IMAGE}:${VERSION} .
-	docker tag ${IMAGE}:${VERSION} ${IMAGE}:latest
-.PHONY:image
-
-push-image:
-	docker push ${IMAGE}:${VERSION}
-	docker push ${IMAGE}:latest
-.PHONY:push-image
-
-release:
-	# amd64
-	for GOOS in "linux" "darwin" "windows"; do \
-		BUILD_CMD="GOOS=$$GOOS GOARCH=amd64 go build -ldflags \"-X main.Version=${VERSION}\" -o releases/${NAME}" ; \
-		TAR_CMD="tar -czvf releases/${NAME}_$${GOOS}_amd64.tar.gz -C releases/ ${NAME} && rm releases/${NAME}" ; \
-		docker run --rm -it -v "${PWD}":/usr/src/app -w /usr/src/app -e CGO_ENABLED=0 golang:1.16-alpine sh -c "$$BUILD_CMD && $$TAR_CMD" ; \
-	done
-	# arm64
-	for GOOS in "darwin"; do \
-		BUILD_CMD="GOOS=$$GOOS GOARCH=arm64 go build -ldflags \"-X main.Version=${VERSION}\" -o releases/${NAME}" ; \
-		TAR_CMD="tar -czvf releases/${NAME}_$${GOOS}_arm64.tar.gz -C releases/ ${NAME} && rm releases/${NAME}" ; \
-		docker run --rm -it -v "${PWD}":/usr/src/app -w /usr/src/app -e CGO_ENABLED=0 golang:1.16-alpine sh -c "$$BUILD_CMD && $$TAR_CMD" ; \
-	done
-.PHONY:release
+install: test
+	go install -ldflags "-X main.Version=${VERSION}"
+.PHONY:install

README.md

@@ -1,5 +1,3 @@
-[![Build Status](https://travis-ci.com/pete911/ipcalc.svg?branch=main)](https://travis-ci.com/pete911/ipcalc)
-
 # ipcalc
 
 Go implementation of ipcalc command.
@@ -11,7 +9,24 @@ Go implementation of ipcalc command.
 ## download
 
 - [binary](https://github.com/pete911/ipcalc/releases)
-- [docker](https://hub.docker.com/repository/docker/pete911/ipcalc)
+
+## build/install
+
+### brew
+
+- add tap `brew tap pete911/tap`
+- install `brew install ipcalc`
+
+### go
+
+[go](https://golang.org/dl/) has to be installed.
+- build `make build`
+- install `make install`
+
+## release
+
+Releases are published when the new tag is created e.g.
+`git tag -m "add super cool feature" v1.0.0 && git push --follow-tags`
 
 ## run