Add workflow to bump the version (#203)

Signed-off-by: Ryan McCue <me@ryanmccue.info>

.github/workflows/bump-version.yml

@@ -0,0 +1,39 @@
+name: Bump version for release
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'New version being released (e.g. "1.0.0")'
+        required: true
+        type: string
+
+jobs:
+  log-the-inputs:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out source code
+        uses: actions/checkout@v4
+
+      - name: Bump version
+        run: |
+          # Replace the "Version:" header in plugin.php
+          sed -i "s/^Version: .*/Version: ${{ inputs.version }}/" plugin.php
+
+          # Replace the VERSION const in plugin.php
+          sed -i "s/^const VERSION = '.*/const VERSION = '${{ inputs.version }}';/" plugin.php
+
+          echo "Bumped version to ${{ inputs.version }}"
+        env:
+          VERSION: ${{ inputs.version }}
+
+      - name: Create pull request
+        uses: peter-evans/create-pull-request@v7
+        with:
+          branch: bump-version
+          commit-message: "Bump version to ${{ inputs.version }}"
+          title: "[bump-version] Bump version to ${{ inputs.version }}"
+          body: "Bump version to ${{ inputs.version }}. Triggered by ${{ github.triggering_actor }}."
+          base: main
+          signoff: true
+          delete-branch: true