Update goreleaser configuration

The Exercism installer requires the exercism windows archivess to be
named slightly differently. In order to generate the archives as part
of the release process, goreleaser has been split into two builds:
release-build and installer-build. The two builds are then archived
separately using the name_template configuration to generate the
properly named zip files. These archives are included in the final
release checksum.

.goreleaser.yml

@@ -1,38 +1,48 @@
 # You can find the GoReleaser documentation at http://goreleaser.com
 project_name: exercism
 
+env:
+  - CGO_ENABLED=0
 builds:
-- env:
-    - CGO_ENABLED=0
-  main: ./exercism/main.go
-  mod_timestamp: '{{ .CommitTimestamp  }}'
-  flags:
-    - -trimpath # removes file system paths from compiled executable
-  ldflags:
-    - '-s -w -X {{ .ModulePath }}/cmd.Version={{.Version}}' # sets binary version to match tag without 'v' prefix
-  goos:
-    - darwin
-    - linux
-    - windows
-    - freebsd
-    - openbsd
-  goarch:
-    - amd64
-    - 386
-    - arm
-    - arm64
-    - ppc64
-  goarm:
-    - 5
-    - 6
-  ignore:
-    - goos: openbsd
-      goarch: arm
-    - goos: freebsd
-      goarch: arm
-
-checksum:
-  name_template: '{{ .ProjectName }}_checksums.txt'
+  - id: release-build
+    main: ./exercism/main.go
+    mod_timestamp: '{{ .CommitTimestamp  }}'
+    flags:
+      - -trimpath # removes file system paths from compiled executable
+    ldflags:
+      - '-s -w -X {{ .ModulePath }}/cmd.Version={{.Version}}' # sets binary version to match tag without 'v' prefix
+    goos:
+      - darwin
+      - linux
+      - windows
+      - freebsd
+      - openbsd
+    goarch:
+      - amd64
+      - 386
+      - arm
+      - arm64
+      - ppc64
+    goarm:
+      - 5
+      - 6
+    ignore:
+      - goos: openbsd
+        goarch: arm
+      - goos: freebsd
+        goarch: arm
+  - id: installer-build
+    main: ./exercism/main.go
+    mod_timestamp: '{{ .CommitTimestamp  }}'
+    flags:
+      - -trimpath # removes file system paths from compiled executable
+    ldflags:
+      - '-s -w -X {{ .ModulePath }}/cmd.Version={{.Version}}' # sets binary version to match tag without 'v' prefix
+    goos:
+      - windows
+    goarch:
+      - amd64
+      - 386
 
 changelog:
   sort: asc
@@ -42,7 +52,10 @@ changelog:
     - '^test:'
 
 archives:
-  - name_template: >-
+  - id: release-archives
+    builds:
+      - release-build
+    name_template: >-
       {{- .ProjectName }}-
       {{- .Version }}-
       {{- .Os }}-
@@ -54,9 +67,33 @@ archives:
     - goos: windows
       format: zip
     files:
-      - shell/**/*
+      - shell/**
       - LICENSE
       - README.md
+  - id: installer-archives
+    builds:
+      - installer-build
+    name_template: >-
+      {{- .ProjectName }}-
+      {{- .Version }}-
+      {{- .Os }}-
+      {{- if eq .Arch "amd64" }}64bit
+      {{- else if eq .Arch "386" }}32bit
+      {{- else }}{{- .Arch }}{{ end }}
+      {{- if .Arm }}v{{- .Arm }}{{ end }}
+    format_overrides:
+    - goos: windows
+      format: zip
+    files:
+      - shell/**
+      - LICENSE
+      - README.md
+
+checksum:
+  name_template: '{{ .ProjectName }}_checksums.txt'
+  ids:
+    - release-archives
+    - installer-archives
 
 signs:
   - artifacts: checksum