chore: cleanup actions and allow reuse + pr template (#1637)

* cleanup actions and allow reuse

* add PR template

.github/workflows/partial-backend.yml

@@ -0,0 +1,88 @@
+name: Backend Test/Lint
+
+on:
+  workflow_call:
+
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+
+    env:
+      PRODUCTION: false
+
+    strategy:
+      fail-fast: true
+      matrix:
+        # Database ENV Variablse as Specified by Mealie
+        Database: [sqlite, postgres]
+
+    # Services
+    services:
+      postgres:
+        image: postgres
+        env:
+          POSTGRES_USER: mealie
+          POSTGRES_PASSWORD: mealie
+          POSTGRES_DB: mealie
+        options: --health-cmd pg_isready --health-interval 10s --health-timeout 5s --health-retries 5
+        ports:
+          - 5432:5432
+    # Steps
+    steps:
+      #----------------------------------------------
+      #       check-out repo and set-up python
+      #----------------------------------------------
+      - name: Check out repository
+        uses: actions/checkout@v2
+      - name: Set up python
+        uses: actions/setup-python@v2
+        with:
+          python-version: "3.10"
+      #----------------------------------------------
+      #  -----  install & configure poetry  -----
+      #----------------------------------------------
+      - name: Install Poetry
+        uses: snok/install-poetry@v1
+        with:
+          virtualenvs-create: true
+          virtualenvs-in-project: true
+      #----------------------------------------------
+      #       load cached venv if cache exists
+      #----------------------------------------------
+      - name: Load cached venv
+        id: cached-poetry-dependencies
+        uses: actions/cache@v2
+        with:
+          path: .venv
+          key: venv-${{ runner.os }}-${{ hashFiles('**/poetry.lock') }}
+      #----------------------------------------------
+      # install dependencies if cache does not exist
+      #----------------------------------------------
+      - name: Install dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install libsasl2-dev libldap2-dev libssl-dev
+          poetry install
+          poetry add "psycopg2-binary==2.8.6"
+        if: steps.cached-poetry-dependencies.outputs.cache-hit != 'true'
+
+      #----------------------------------------------
+      #              run test suite
+      #----------------------------------------------
+      - name: Formatting (Black & isort)
+        run: |
+          poetry run black . --check
+          poetry run isort . --check-only
+      - name: Lint (Flake8)
+        run: |
+          make backend-lint
+      - name: Mypy Typecheck
+        run: |
+          make backend-typecheck
+      - name: Pytest
+        env:
+          DB_ENGINE: ${{ matrix.Database }}
+          POSTGRES_SERVER: localhost
+        run: |
+          make backend-test