Fix release notes (#29)

Author: fmenezes

.github/workflows/tag.yml

@@ -18,15 +18,8 @@ jobs:
     - name: Set $TAG env var
       run: echo "${{github.ref}}" | sed 's/refs\/tags\///' | xargs -I $ echo "::set-env name=TAG::$"
 
-    - name: Set $PREVIOUS_TAG env var
-      run: git tag --sort=refname | grep $TAG -B 1 | grep -m1 "" | xargs -I $ echo "::set-env name=PREVIOUS_TAG::$"
-
     - name: Generate list of changes
-      run: |
-      cat > release.md <<EOF
-## Changes
-$(git log $TAG...$PREVIOUS_TAG --format="- [%h](../../commit/%h) %s")
-EOF
+      run: scripts/generate_release_notes.sh > .release.md
 
     - name: Generate build files
       uses: thatisuday/go-cross-build@v1
@@ -45,7 +38,7 @@ EOF
       with:
         tag_name: ${{ github.ref }}
         release_name: ${{ github.ref }}
-        body_path: ./release.md
+        body_path: ./.release.md
 
     - name: Upload Release Asset (darwin-amd64)
       uses: actions/upload-release-asset@v1

scripts/generate_release_notes.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+
+if [ -z "$TAG" ]
+then
+      echo "\$TAG is empty"
+      exit 1
+fi
+
+export PREVIOUS_TAG=$(git tag --sort=refname | grep $TAG -B 1 | grep -m1 "")
+
+cat <<EOF
+## Changes
+$(git log $TAG...$PREVIOUS_TAG --format="- [%h](../../commit/%h) %s")
+EOF