Implement complete GitHub Actions CI for Notes project

- Release workflow: semantic versioning on main branch
- Build snapshot: RPM snapshots on release/** branches
- Build release: RPM releases on v* tags
- Automated tagging and artifact uploads

Author: Luca Pisani

.github/workflows/build-rpm.yml

@@ -1,11 +1,11 @@
-name: Build RPM
+name: Build Release
 
 on:
   push:
     tags: [ 'v*' ]  # Si attiva solo quando c'è un tag creato da semantic-release
 
 jobs:
-  build:
+  build-release:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4

.github/workflows/build-snapshot.yml

@@ -0,0 +1,32 @@
+name: Build Snapshot
+
+on:
+  push:
+    branches: [ 'release/**' ]
+
+jobs:
+  build-snapshot:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install dependencies
+        run: |
+          sudo apt update
+          sudo apt install -y rpm
+      - name: Get version
+        run: |
+          BRANCH_NAME=${GITHUB_REF#refs/heads/release/}
+          VERSION="${BRANCH_NAME}-snapshot"
+          echo "VERSION=$VERSION" >> $GITHUB_ENV
+      - name: Create source tarball
+        run: |
+          tar -czf notes-${VERSION}.tar.gz --exclude=.git --exclude=.github .
+      - name: Build RPM
+        run: |
+          mkdir -p ~/rpmbuild/{BUILD,RPMS,SOURCES,SPECS,SRPMS}
+          mv notes-${VERSION}.tar.gz ~/rpmbuild/SOURCES/
+          rpmbuild -ba packaging/notes.spec --define "version $VERSION"
+      - uses: actions/upload-artifact@v4
+        with:
+          name: notes-${{ env.VERSION }}-snapshot.noarch.rpm
+          path: ~/rpmbuild/RPMS/noarch/notes-${{ env.VERSION }}-snapshot.noarch.rpm