Added workflow.

Author: sigma-axis

.github/workflows/releaser.yml

@@ -0,0 +1,63 @@
+name: Make Release
+on:
+  push:
+    tags:
+    - '*'
+
+env:
+  REPOSITORY_NAME: Basic_S
+
+  TIME_ZONE: Asia/Tokyo
+  # Time zone for the timestamp when releasing.
+
+permissions:
+  contents: read
+
+jobs:
+  release:
+    name: Create Release
+    if: github.event_name == 'push' && github.ref_type == 'tag'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        submodules: recursive
+
+    - name: Pack and compress
+      run: |
+        mkdir pack
+        cp *.anm2 pack
+        cp *.obj2 pack
+        cp *.md pack
+        cp LICENSE pack/LICENSE
+        cd pack
+        zip -r ../aviutl2_script_${{ env.REPOSITORY_NAME }}-${{ github.ref_name }}.zip *
+      # rename .zip file for downloading if necessary.
+
+    - name: Prepare release notes
+      id: release-notes
+      run: |
+        echo "name=${{ github.ref_name }} ($(TZ='${{ env.TIME_ZONE }}' date +'%Y-%m-%d'))" >> $GITHUB_OUTPUT
+        echo "### 更新内容" >> ReleaseNotes.txt
+        phase=0
+        IFS=$'\n'
+        cat pack/README.md | while read line; do
+          if [[ $phase == 0 ]]; then
+            if [[ $line =~ ^##*[[:space:]]{1,}'改版履歴'[[:space:]]*$ ]]; then phase=1; fi
+          elif [[ $phase == 1 ]]; then
+            if [[ $line =~ ^-[[:space:]] ]]; then phase=2; fi
+          elif [[ $line =~ ^(-|##*)[[:space:]] ]]; then break
+          else
+            echo ${line:2} >> ReleaseNotes.txt
+          fi
+        done
+
+    - name: Release
+      uses: softprops/action-gh-release@v2
+      with:
+        name: ${{ steps.release-notes.outputs.name }}
+        files: '*.zip'
+        body_path: ReleaseNotes.txt