ci: split library build and python tests into separate jobs

This way if flaky python tests fail,
it is possible to rerun them without having to rerun library compilation.
Python test jobs will redownload already built library artifact
and compile the bindings against it.

.github/workflows/ci.yml

@@ -64,22 +64,18 @@ jobs:
       - name: Rustdoc
         run: cargo doc --document-private-items --no-deps
 
-  build_and_test:
-    name: Build and test
+  c_library:
+    name: Rust tests and C library build
     strategy:
-      fail-fast: false
       matrix:
         include:
           # Currently used Rust version.
           - os: ubuntu-latest
-            rust: 1.68.0
-            python: 3.9
+            rust: 1.68.2
           - os: windows-latest
-            rust: 1.68.0
-            python: false # Python bindings compilation on Windows is not supported.
+            rust: 1.68.2
           - os: macos-latest
-            rust: 1.68.0
-            python: 3.9
+            rust: 1.68.2
 
           # Minimum Supported Rust Version = 1.65.0
           #
@@ -88,10 +84,9 @@ jobs:
           # built.
           - os: ubuntu-latest
             rust: 1.65.0
-            python: 3.7
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@master
+      - uses: actions/checkout@v3
 
       - name: Install Rust ${{ matrix.rust }}
         run: rustup toolchain install --profile minimal ${{ matrix.rust }}
@@ -109,55 +104,97 @@ jobs:
       - name: Test cargo vendor
         run: cargo vendor
 
+      - name: Build C library
+        run: cargo build -p deltachat_ffi --features jsonrpc
+
+      - name: Upload C library
+        if: matrix.os != "windows-latest"
+        uses: actions/upload-artifact@v3
+        with:
+          name: ${{ matrix.os }}-${{matrix.rust}}-libdeltachat.a
+          path: target/debug/libdeltachat.a
+
+  python_lint:
+    name: Python lint
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v3
+
+      - name: Install tox
+        run: pip install tox
+
+      - name: Lint Python bindings
+        working-directory: python
+        run: tox -e lint,mypy,doc
+
+      - name: Lint deltachat-rpc-client
+        working-directory: deltachat-rpc-client
+        run: tox -e lint
+
+  python_tests:
+    name: Python tests
+    needs: ["c_library", "python_lint"]
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          # Currently used Rust version.
+          - os: ubuntu-latest
+            rust: 1.68.2
+            python: 3.11
+          - os: macos-latest
+            rust: 1.68.2
+            python: 3.11
+
+          # PyPy tests
+          - os: ubuntu-latest
+            rust: 1.68.2
+            python: pypy3.9
+          - os: macos-latest
+            rust: 1.68.2
+            python: pypy3.9
+
+          # Minimum Supported Python Version = 3.7
+          # This is the minimum version for which manylinux Python wheels are
+          # built. Test it with minimum supported Rust version.
+          - os: ubuntu-latest
+            rust: 1.65.0
+            python: 3.7
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Download libdeltachat.a
+        uses: actions/download-artifact@v3
+        with:
+          name: ${{ matrix.os }}-${{matrix.rust}}-libdeltachat.a
+          path: target/debug
+
       - name: Install python
-        if: ${{ matrix.python }}
         uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python }}
 
       - name: Install tox
-        if: ${{ matrix.python }}
         run: pip install tox
 
-      - name: Build C library
-        if: ${{ matrix.python }}
-        run: cargo build -p deltachat_ffi --features jsonrpc
-
       - name: Run python tests
-        if: ${{ matrix.python }}
         env:
           DCC_NEW_TMP_EMAIL: ${{ secrets.DCC_NEW_TMP_EMAIL }}
           DCC_RS_TARGET: debug
           DCC_RS_DEV: ${{ github.workspace }}
         working-directory: python
-        run: tox -e lint,mypy,doc,py3
+        run: tox -e py
 
       - name: Build deltachat-rpc-server
-        if: ${{ matrix.python }}
         run: cargo build -p deltachat-rpc-server
 
       - name: Add deltachat-rpc-server to path
-        if: ${{ matrix.python }}
         run: echo ${{ github.workspace }}/target/debug >> $GITHUB_PATH
 
       - name: Run deltachat-rpc-client tests
-        if: ${{ matrix.python }}
         env:
           DCC_NEW_TMP_EMAIL: ${{ secrets.DCC_NEW_TMP_EMAIL }}
         working-directory: deltachat-rpc-client
-        run: tox -e py3,lint
-
-      - name: Install pypy
-        if: ${{ matrix.python }}
-        uses: actions/setup-python@v4
-        with:
-          python-version: "pypy${{ matrix.python }}"
-
-      - name: Run pypy tests
-        if: ${{ matrix.python }}
-        env:
-          DCC_NEW_TMP_EMAIL: ${{ secrets.DCC_NEW_TMP_EMAIL }}
-          DCC_RS_TARGET: debug
-          DCC_RS_DEV: ${{ github.workspace }}
-        working-directory: python
-        run: tox -e pypy3
+        run: tox -e py