ci: build XPI on every src/ change

Produces a versioned .xpi artifact on each push touching src/.
On main, also updates the latest-dev pre-release with the new build.

.github/workflows/build-xpi.yml

@@ -0,0 +1,82 @@
+name: Build XPI
+
+on:
+  push:
+    branches:
+      - main
+      - "feat/**"
+      - "fix/**"
+    paths:
+      - "src/**"
+
+jobs:
+  build:
+    name: Package extension
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: write   # nécessaire pour créer la release et uploader l'artefact
+
+    steps:
+      # ---------------------------------------------------------------
+      # 1. Récupérer le code
+      # ---------------------------------------------------------------
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      # ---------------------------------------------------------------
+      # 2. Lire la version depuis manifest.json
+      # ---------------------------------------------------------------
+      - name: Read version
+        id: version
+        run: |
+          VERSION=$(jq -r '.version' src/manifest.json)
+          echo "version=${VERSION}" >> "$GITHUB_OUTPUT"
+          echo "xpi_name=ytptube-extension-${VERSION}.xpi" >> "$GITHUB_OUTPUT"
+
+      # ---------------------------------------------------------------
+      # 3. Construire le XPI (= zip renommé)
+      # ---------------------------------------------------------------
+      - name: Build XPI
+        run: |
+          cd src
+          zip -r "../${{ steps.version.outputs.xpi_name }}" . \
+            -x "*.git*" "*.DS_Store" "*.idea*" "*.vscode*" \
+               "node_modules/*" "dist/*" "build/*"
+          cd ..
+          echo "Contenu du XPI :"
+          unzip -l "${{ steps.version.outputs.xpi_name }}"
+
+      # ---------------------------------------------------------------
+      # 4. Uploader comme artefact CI (disponible dans l'onglet Actions)
+      # ---------------------------------------------------------------
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: ${{ steps.version.outputs.xpi_name }}
+          path: ${{ steps.version.outputs.xpi_name }}
+          retention-days: 30
+
+      # ---------------------------------------------------------------
+      # 5. Créer ou mettre à jour la pre-release "latest-dev"
+      #    (uniquement sur la branche main)
+      # ---------------------------------------------------------------
+      - name: Create or update dev release
+        if: github.ref == 'refs/heads/main'
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          TAG="latest-dev"
+          XPI="${{ steps.version.outputs.xpi_name }}"
+          SHORT_SHA="${GITHUB_SHA::7}"
+          TITLE="Dev build v${{ steps.version.outputs.version }} (${SHORT_SHA})"
+
+          # Supprimer l'ancienne release/tag si elle existe
+          gh release delete "$TAG" --yes 2>/dev/null || true
+          git push --delete origin "$TAG" 2>/dev/null || true
+
+          # Recréer la release pre-release avec le nouveau XPI
+          gh release create "$TAG" "$XPI" \
+            --title "$TITLE" \
+            --notes "Build automatique du commit \`${SHORT_SHA}\` sur \`main\`." \
+            --prerelease