Replace GitHub Actions build workflow with Gitea workflow

.github/workflows/build.yml

@@ -1,64 +0,0 @@
----
-name: Test and build Docker image
-on:
-  push:
-  pull_request:
-  workflow_dispatch:
-  schedule:
-    - cron: "0 6 * * *"
-
-env:
-  TEST_WEBHOOK_URL: ${{ secrets.TEST_WEBHOOK_URL }}
-
-jobs:
-  test:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
-        with:
-          python-version: 3.12
-      - uses: astral-sh/setup-uv@v5
-        with:
-          version: "latest"
-      - run: uv sync --all-extras --all-groups
-      - run: uv run pytest
-  ruff:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - uses: astral-sh/ruff-action@v3
-        with:
-          version: "latest"
-      - run: ruff check --exit-non-zero-on-fix --verbose
-      - run: ruff format --check --verbose
-
-  build:
-    runs-on: ubuntu-latest
-    permissions:
-      contents: read
-      packages: write
-    if: github.event_name != 'pull_request'
-    concurrency:
-      group: ${{ github.workflow }}-${{ github.ref }}
-      cancel-in-progress: true
-    needs: [test, ruff]
-    steps:
-      - uses: actions/checkout@v4
-      - uses: docker/setup-qemu-action@v3
-        with:
-          platforms: all
-      - uses: docker/setup-buildx-action@v3
-      - uses: docker/login-action@v3
-        with:
-          registry: ghcr.io
-          username: ${{ github.repository_owner }}
-          password: ${{ secrets.GITHUB_TOKEN }}
-      - uses: docker/build-push-action@v6
-        with:
-          context: .
-          platforms: linux/amd64, linux/arm64
-          push: ${{ github.event_name != 'pull_request' }}
-          tags: |
-            ghcr.io/thelovinator1/discord-rss-bot:latest
-            ghcr.io/thelovinator1/discord-rss-bot:master