Add GitHub Actions workflow for calendar release

.github/workflows/calendar-release.yml

@@ -0,0 +1,117 @@
+name: Generate and Release Calendar
+
+on:
+  push:
+    paths:
+      - 'calendar/cpp-aachen.jsoncal'
+  workflow_dispatch:
+
+permissions:
+  contents: write
+
+jobs:
+  generate-calendar:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.11'
+          cache: 'pip'
+
+      - name: Install Python dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install icalendar
+
+      - name: Download json2ical.py script
+        run: |
+          curl -o json2ical.py https://raw.githubusercontent.com/d-frey/json2ical/refs/heads/main/json2ical.py
+          chmod +x json2ical.py
+
+      - name: Generate iCal file
+        run: |
+          python json2ical.py calendar/cpp-aachen.jsoncal cpp-aachen.ics
+
+      - name: Get current timestamp
+        id: timestamp
+        run: echo "timestamp=$(date +'%Y%m%d-%H%M%S')" >> $GITHUB_OUTPUT
+
+      - name: Create or update latest release
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const fs = require('fs');
+            const { owner, repo } = context.repo;
+
+            // Try to get existing "latest" release
+            let release;
+            try {
+              const existingRelease = await github.rest.repos.getReleaseByTag({
+                owner,
+                repo,
+                tag: 'latest'
+              });
+              release = existingRelease.data;
+
+              // Delete existing assets
+              const assets = await github.rest.repos.listReleaseAssets({
+                owner,
+                repo,
+                release_id: release.id
+              });
+
+              for (const asset of assets.data) {
+                await github.rest.repos.deleteReleaseAsset({
+                  owner,
+                  repo,
+                  asset_id: asset.id
+                });
+              }
+
+              // Update release
+              await github.rest.repos.updateRelease({
+                owner,
+                repo,
+                release_id: release.id,
+                name: 'Latest Calendar Release',
+                body: `Automatically generated iCal calendar file from cpp-aachen.jsoncal\\n\\nGenerated on: ${new Date().toISOString()}\\n\\nThis release is automatically updated when the calendar file changes.`
+              });
+
+            } catch (error) {
+              if (error.status === 404) {
+                // Create new release if "latest" doesn't exist
+                const newRelease = await github.rest.repos.createRelease({
+                  owner,
+                  repo,
+                  tag_name: 'latest',
+                  name: 'Latest Calendar Release', 
+                  body: `Automatically generated iCal calendar file from cpp-aachen.jsoncal\\n\\nGenerated on: ${new Date().toISOString()}\\n\\nThis release is automatically updated when the calendar file changes.`,
+                  draft: false,
+                  prerelease: false
+                });
+                release = newRelease.data;
+              } else {
+                throw error;
+              }
+            }
+
+            // Upload the iCal file
+            const fileContent = fs.readFileSync('cpp-aachen.ics');
+
+            await github.rest.repos.uploadReleaseAsset({
+              owner,
+              repo,
+              release_id: release.id,
+              name: 'cpp-aachen.ics',
+              data: fileContent,
+              headers: {
+                'content-type': 'text/calendar'
+              }
+            });
+
+            core.info(`Successfully uploaded cpp-aachen.ics to release ${release.tag_name}`);