cicd: add discord announcement webhook for ChaosMod releases

.github/workflows/announcement.yml

@@ -0,0 +1,38 @@
+name: Post Announcement
+on:
+  workflow_run:
+    workflows: [ nightly ]
+    types: [ completed ]
+  workflow_dispatch:
+
+jobs:
+  discord:
+    runs-on: ubuntu-latest
+    if: ${{ github.event_name == 'workflow_dispatch' || github.event.workflow_run.conclusion == 'success' }}
+    steps:
+      - name: Get Latest Release
+        id: version
+        shell: bash
+        run: |
+          JSON=$(curl -L --silent \
+            -H "Accept: application/vnd.github+json" \
+            -H "Authorization: Bearer ${{ github.token }}" \
+            -H "X-GitHub-Api-Version: 2022-11-28" \
+            "https://api.github.com/repos/TheStarport/ChaosMod/releases/latest" | \
+            jq -r '{ "upload_url", "body" }')
+          URL=$(echo "$JSON" | jq -r .["html_url"])
+          BODY=$(echo "$JSON" | jq -r .["body"])
+          echo "URL=$URL" >> $GITHUB_OUTPUT
+          echo "BODY=$BODY" >> $GITHUB_OUTPUT
+
+      - name: Publish to Discord
+        uses: tsickert/[email protected]
+        with:
+          webhook-url: ${{ secrets.DISCORD_ANNOUNCEMENT_WEBHOOK_URL }}
+          embed-title: Chaos Mod Release Published!
+          embed-url: ${{ steps.version.outputs.URL }}
+          embed-color: 65535
+          embed-description: |
+            Changelog:
+            
+            ${{ steps.version.outputs.BODY }}