Use CHANGELOG for release description

`goreleaser` use git commits for building release description.
It is sorted by commit messages and does not provide a clarity.
Update release workflow to extract sevversion changelog from
`CHANGELOG.md` and use it for `goreleaser`.

.github/workflows/release.yml

@@ -36,12 +36,19 @@ jobs:
         with:
           go-version: 1.17
 
+      -
+        name: Build release changelog
+        run: |
+          version=${GITHUB_REF#refs/tags/v*}
+          mkdir -p tmp
+          sed '/^# \['$version'\]/,/^# \[/!d;//d;/^\s*$/d' CHANGELOG.md > tmp/release_changelog.md
+
       -
         name: Release
         uses: goreleaser/goreleaser-action@5a54d7e660bda43b405e8463261b3d25631ffe86
         with:
           distribution: goreleaser
           version: v0.176.0
-          args: release --rm-dist
+          args: release --rm-dist --release-notes=tmp/release_changelog.md
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.gitignore

@@ -3,3 +3,5 @@ dist/
 
 # go mod dependencies
 vendor/
+
+tmp/

.goreleaser.yml

@@ -127,6 +127,7 @@ changelog:
     exclude:
       - '^docs:'
       - '^test:'
+      - '^Merge'
 
 archives:
   -

CHANGELOG.md

@@ -1,6 +1,10 @@
 # [Unreleased]
 
 
+# [2.1.6-test]
+
+Test
+
 # [2.1.5]
 
 * Move to Go Modules from godeps (#253, @epk)