Add tagging (#3)

Author: fmenezes

.github/workflows/tag.yml

@@ -0,0 +1,31 @@
+name: Tag
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+
+  tag:
+    name: Create Release
+    runs-on: ubuntu-latest
+    steps:
+
+    - name: Check out code
+      uses: actions/checkout@v2
+      with:
+        fetch-depth: 0
+
+    - name: Generate list of changes
+      run: scripts/generate_release_notes.sh > .release.md
+
+    - name: Create Github Release
+      uses: actions/create-release@v1
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      with:
+        tag_name: ${{ github.ref }}
+        release_name: ${{ github.ref }}
+        body_path: ./.release.md
+

scripts/generate_release_notes.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+
+GITHUB_REF=${GITHUB_REF:-HEAD}
+
+git rev-parse $GITHUB_REF > /dev/null 2>&1
+if [ $? != 0 ]
+then
+      echo "\$GITHUB_REF is invalid"
+      exit 1
+fi
+
+if [[ $GITHUB_REF = refs/tags/* ]]
+then
+      # previous tag
+      export PREVIOUS_REF=$(git tag --sort=refname --format='%(refname)' | grep $GITHUB_REF -B 1 | grep -m1 "")
+else
+      # latest tag
+      export PREVIOUS_REF=$(git tag --sort=-refname --format='%(refname)' | grep -m1 "")
+fi
+
+cat <<EOF | sed '/Merge pull request/d'
+## Changes
+$(git log $GITHUB_REF...$PREVIOUS_REF --format="- [%h](../../commit/%h) %s")
+EOF