add workflow for automatic tag creation

.github/workflows/tag.yaml

@@ -0,0 +1,29 @@
+name: Tag for release
+on:
+  push:
+    paths:
+      - configure.ac 
+    branches:
+      - 'main'
+jobs:
+  tag_release:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+    - name: Get tag name
+      id: get-tag
+      run: echo "TAGNAME=`grep -o -E '?[0-9]{4}\.[0-9]{2}(\.[0-9]{2})?' configure.ac`" >> "$GITHUB_OUTPUT"
+    - name: Create tag
+      uses: actions/github-script@v5
+      env:
+        TAG: ${{ steps.get-tag.outputs.TAGNAME }}
+      with:
+        script: |
+          const title = process.env.TAG;
+          github.rest.git.createRef({
+            owner: context.repo.owner,
+            repo: context.repo.repo,
+            ref: `refs/tags/${title}`,
+            sha: context.sha
+          })

.github/workflows/version.yml

@@ -0,0 +1,21 @@
+# appends -dev to the version upon release and opens pr
+# CI won't run on generated PR, easiest workaround is to close + reopen
+on:
+  release:
+    types: [published]
+jobs:
+  add-dev-to-version:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4.2.2
+    - name: Append version with dev
+      run: sed -i '/20[0-9][0-9]\.[0-9][0-9]/ s/]/-dev]/' configure.ac
+    - name: Create pull request
+      uses: peter-evans/create-pull-request@v7.0.6
+      with:
+        base: main                   # creates a new branch off of main
+        branch: add-dev-post-release # name of the created branch
+        branch-suffix: timestamp     # add a timestamp to branch name
+        delete-branch: true          # delete afer merge
+        title: Append dev to version number post-release
+        body: automated change, adds '-dev' to the version number upon releases. This PR will need to be closed and reopened to run CI testing.