bump version and release on successful run

.github/workflows/go.yml

@@ -13,6 +13,8 @@ jobs:
 
   build:
     runs-on: macos-latest
+    permissions:
+      contents: write
     strategy:
       matrix:
         go:
@@ -32,6 +34,8 @@ jobs:
     - uses: actions/checkout@v4
       with:
         path: getargv.go
+        fetch-tags: true
+        fetch-depth: 0 # until https://github.com/actions/checkout/issues/1471 fixed
     - name: Set up Go
       uses: actions/setup-go@v5
       with:
@@ -43,3 +47,18 @@ jobs:
 
     - name: Test
       run: go test -C getargv.go
+
+    - name: Bump Version
+      id: bump_version
+      run: git tag | sort -V | tail -1 | awk -F. 'BEGIN { OFS = "." } {$NF+=1; print $0}' | xargs -I {} echo "new_version={}" >> $GITHUB_OUTPUT
+      working-directory: getargv-swift
+    - name: create && push tag
+      run: |
+        git tag '${{ steps.bump_version.outputs.new_version }}'
+        git push origin tag '${{ steps.bump_version.outputs.new_version }}'
+        git push origin HEAD:main
+      working-directory: getargv-swift
+    - uses: softprops/action-gh-release@v1
+      with:
+        name: ${{ steps.bump_version.outputs.new_version }}
+        tag_name: ${{ steps.bump_version.outputs.new_version }}