ci: added release (semi)automation

- security: updated Golang version to 1.12.8 for CI builds
- added: configuration for build and release automation using GoReleaser
(https://goreleaser.com)
- (Releases will be semi-automatic for now due to the need of the access
token. When/if project specific access token is supported then I'll
complete the release stage of the pipeline.)
- added: version.go for printing out the versions

.gitignore

@@ -1,3 +1,4 @@
 tags
 bin/*
 !bin/.gitkeep
+dist/

.gitlab-ci.yml

@@ -1,25 +1,16 @@
 ---
-image: golang:1.12.6
+image: golang:1.12.8
+
+variables:
+  CGO_ENABLED: 0
 
 stages:
 - test
-- build
 #- release
 
-test:
+test:unit:
   stage: test
   script:
-  - make test
+  - make test_unit
 
-build:
+#release
-  stage: build
-  script:
-  - make build
-  artifacts:
-    expire_in: 1 hour
-    name: "pominal-$CI_COMMIT_REF_SLUG"
-    paths:
-    - bin/pominal
-  only:
-    refs:
-    - master

.goreleaser.yml

@@ -0,0 +1,50 @@
+---
+project_name: pominal
+
+before:
+  hooks:
+  - go mod download
+
+builds:
+- binary: pominal
+  env:
+  - CGO_ENABLED=0
+  flags:
+  - -a
+  - -v
+  goarch:
+  - 386
+  - amd64
+  goos:
+  - linux
+  id: pominal-build
+  ldflags:
+  - s -w -X main.version={{.Version}} -X main.commit={{.ShortCommit}} -X main.date={{.Date}} -X main.goversion={{.Env.GOVERSION}}
+
+archives:
+- files:
+  - LICENSE
+  - README.md
+  format: tar.gz
+  id: pominal-archive
+  name_template: "{{ .ProjectName }}-{{ .Version }}-{{ .Os }}-{{ .Arch }}"
+  replacements:
+    386: i386
+    amd64: x86_64
+  wrap_in_directory: true
+    
+checksum:
+  algorithm: sha256
+  name_template: "{{ .ProjectName }}-{{ .Version }}-CHECKSUMS.txt"
+
+snapshot:
+  name_template: "SNAPSHOT-{{ .ShortCommit }}"
+
+changelog:
+  sort: desc
+  filters:
+    exclude:
+    - "^docs:"
+    - "^test:"
+    - "^chore:"
+    - "^ci:"

Makefile

@@ -1,13 +1,16 @@
-.PHONY: all test build clean
+NAME := pominal
+BIN_DIR := ./bin
+BIN_FILE := $(BIN_DIR)/$(NAME)
 
-all: test build
+.PHONY: all test_unit build clean
 
-test:
+all: test_unit build
+
+test_unit:
 	go test -v -cover ./...
 
 build:
-	go build -a -v -o bin/pominal
+	go build -a -v -o $(BIN_FILE)
 
 clean:
 	go clean
-	find bin -type f -not -iname .gitkeep | xargs -I v rm v

version.go

@@ -0,0 +1,14 @@
+package main
+
+import "fmt"
+
+var (
+	commit    string
+	date      string
+	goversion string
+	version   string
+)
+
+func Version() {
+	fmt.Printf("Version: %s\nCommit: %s\nGo Version: %s\nDate: %s", version, commit, goversion, date)
+}