Simplify goreleaser, package deb and rpm

This commit simplifies the goreleaser configuration and then adds nfpm
support which allows us to build .deb and .rpm for each of the ARCH we
support.

The deb and rpm packages adds systemd services and users, creates
directories etc and should in general give the user a working
environment. We should be able to remove a lot of the complicated,
PEBCAK inducing documentation after this.

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>

.goreleaser.yml

@@ -7,15 +7,21 @@ release:
   prerelease: auto
 
 builds:
-  - id: darwin-amd64
+  - id: headscale
     main: ./cmd/headscale/headscale.go
     mod_timestamp: "{{ .CommitTimestamp }}"
     env:
       - CGO_ENABLED=0
-    goos:
-      - darwin
-    goarch:
-      - amd64
+    targets:
+      - darwin_amd64
+      - darwin_arm64
+      - freebsd_amd64
+      - linux_386
+      - linux_amd64
+      - linux_arm64
+      - linux_arm_5
+      - linux_arm_6
+      - linux_arm_7
     flags:
       - -mod=readonly
     ldflags:
@@ -23,60 +29,59 @@ builds:
     tags:
       - ts2019
 
-  - id: darwin-arm64
-    main: ./cmd/headscale/headscale.go
-    mod_timestamp: "{{ .CommitTimestamp }}"
-    env:
-      - CGO_ENABLED=0
-    goos:
-      - darwin
-    goarch:
-      - arm64
-    flags:
-      - -mod=readonly
-    ldflags:
-      - -s -w -X github.com/juanfont/headscale/cmd/headscale/cli.Version=v{{.Version}}
-    tags:
-      - ts2019
-
-  - id: linux-amd64
-    mod_timestamp: "{{ .CommitTimestamp }}"
-    env:
-      - CGO_ENABLED=0
-    goos:
-      - linux
-    goarch:
-      - amd64
-    main: ./cmd/headscale/headscale.go
-    ldflags:
-      - -s -w -X github.com/juanfont/headscale/cmd/headscale/cli.Version=v{{.Version}}
-    tags:
-      - ts2019
-
-  - id: linux-arm64
-    mod_timestamp: "{{ .CommitTimestamp }}"
-    env:
-      - CGO_ENABLED=0
-    goos:
-      - linux
-    goarch:
-      - arm64
-    main: ./cmd/headscale/headscale.go
-    ldflags:
-      - -s -w -X github.com/juanfont/headscale/cmd/headscale/cli.Version=v{{.Version}}
-    tags:
-      - ts2019
-
 archives:
   - id: golang-cross
     builds:
-      - darwin-amd64
-      - darwin-arm64
-      - linux-amd64
-      - linux-arm64
+      - darwin_amd64
+      - darwin_arm64
+      - freebsd_amd64
+      - linux_386
+      - linux_amd64
+      - linux_arm64
+      - linux_arm_5
+      - linux_arm_6
+      - linux_arm_7
     name_template: "{{ .ProjectName }}_{{ .Version }}_{{ .Os }}_{{ .Arch }}"
     format: binary
 
+nfpms:
+  # Configure nFPM for .deb and .rpm releases
+  #
+  # See https://nfpm.goreleaser.com/configuration/
+  # and https://goreleaser.com/customization/nfpm/
+  #
+  # Useful tools for debugging .debs:
+  # List file contents: dpkg -c dist/headscale...deb
+  # Package metadata: dpkg --info dist/headscale....deb
+  #
+  - builds:
+      - headscale
+    package_name: headscale
+    priority: optional
+    vendor: headscale
+    maintainer: Kristoffer Dalby <kristoffer@dalby.cc>
+    homepage: https://github.com/juanfont/headscale
+    license: BSD
+    bindir: /usr/bin
+    formats:
+      - deb
+      - rpm
+    contents:
+      - src: ./config-example.yaml
+        dst: /etc/headscale/config.yaml
+        type: config|noreplace
+        file_info:
+          mode: 0644
+      - src: ./docs/packaging/headscale.systemd.service
+        dst: /etc/systemd/system/headscale.service
+      - dst: /var/lib/headscale
+        type: dir
+      - dst: /var/run/headscale
+        type: dir
+    scripts:
+      postinstall: ./docs/packaging/postinstall.sh
+      postremove: ./docs/packaging/postremove.sh
+
 checksum:
   name_template: "checksums.txt"
 snapshot: