Add CI config and pkg.go.dev link

.drone.yml

@@ -0,0 +1,27 @@
+kind: pipeline
+name: build & release
+
+steps:
+- name: fetch tags
+  image: docker:git
+  commands:
+    - git fetch --tags
+  when:
+    event: tag
+- name: test
+  image: golang:1.14
+  commands:
+    - go test -v ./internal/gemini
+  when:
+    event:
+      exclude:
+      - tag
+- name: release
+  image: golang:1.15
+  environment:
+    GITEA_TOKEN:
+      from_secret: goreleaser_gitea_token
+  commands:
+    - curl -sL https://git.io/goreleaser | bash
+  when:
+    event: tag

.goreleaser.yml

@@ -0,0 +1,51 @@
+builds:
+- main: ./cmd/gmnhg
+  id: gmnhg
+  env:
+  - CGO_ENABLED=0
+  goos:
+  - linux
+  - windows
+  - darwin
+  - freebsd
+  - openbsd
+  - netbsd
+- main: ./cmd/md2gmn
+  id: md2gmn
+  env:
+  - CGO_ENABLED=0
+  goos:
+  - linux
+  - windows
+  - darwin
+  - freebsd
+  - openbsd
+  - netbsd
+archives:
+- replacements:
+    darwin: Darwin
+    linux: Linux
+    windows: Windows
+    freebsd: FreeBSD
+    openbsd: OpenBSD
+    netbsd: NetBSD
+    386: i386
+    amd64: x86_64
+checksum:
+  name_template: 'checksums.txt'
+snapshot:
+  name_template: "{{ .Tag }}-next"
+changelog:
+  sort: asc
+  filters:
+    exclude:
+    - '^docs:'
+    - '^test:'
+
+release:
+  gitea:
+    owner: tdemin
+    name: gmnhg
+
+gitea_urls:
+  api: https://git.tdem.in/api/v1/

README.md

@@ -1,5 +1,7 @@
 # Hugo-to-Gemini converter
 
+[![PkgGoDev](https://pkg.go.dev/badge/git.tdem.in/tdemin/gmnhg)](https://pkg.go.dev/git.tdem.in/tdemin/gmnhg)
+
 This repo holds a converter of Hugo Markdown posts to
 [text/gemini][Gemtext] (also named Gemtext in this README). The
 converter is supposed to make people using [Hugo](https://gohugo.io)'s