chore: fix dockerfile and update ci/cd piplines

.gitea/workflows/ci-back.yml

@@ -0,0 +1,39 @@
+name: Backend ci
+
+on:
+  push:
+    branches:
+      - master
+      - develop
+  pull_request:
+    branches:
+      - master
+defaults:
+  run:
+    working-directory: backend
+
+
+
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+      - name: Go setup
+        uses: actions/setup-go@v6
+        with:
+          go-version: '1.25'
+          cache: false
+      - name: Install deps
+        run: go mod tidy
+      - name: Golangci-lint
+        uses: golangci/golangci-lint-action@v9.2.0
+        with:
+          args: --timeout=5m
+          skip-cache: true
+      - name: Run tests
+        run: go test ./...
+      - name: Build
+        run: go build -o backend ./cmd/banforge