feat: Add Gitea workflow to build and release the Firefox extension.

.gitea/workflows/build.yaml

@@ -13,7 +13,12 @@ on:
 jobs:
   build:
     runs-on: docker
+    container:
+      image: node:20-alpine
     steps:
+      - name: Install dependencies
+        run: apk add --no-cache zip jq
+
       - name: Checkout repository
         uses: actions/checkout@v4
 
@@ -54,9 +59,13 @@ jobs:
 
   release:
     runs-on: docker
+    container:
+      image: node:20-alpine
     needs: build
     if: startsWith(github.ref, 'refs/tags/v')
     steps:
+      - name: Install dependencies
+        run: apk add --no-cache jq
       - name: Checkout repository
         uses: actions/checkout@v4