Add a "posix port"

.github/workflows/run-tests.yml

@@ -17,7 +17,7 @@ jobs:
     env:
       CP_VERSION: ${{ inputs.cp-version }}
       MICROPY_CPYTHON3: python3.8
-      MICROPY_MICROPYTHON: ../ports/unix/build-coverage/micropython
+      MICROPY_MICROPYTHON: ../ports/posix/circuitpython
       TEST_all:
       TEST_mpy: --via-mpy -d basics float micropython
       TEST_native: --emit native
@@ -44,24 +44,5 @@ jobs:
       uses: ./.github/actions/mpy_cross
       with:
         cp-version: ${{ inputs.cp-version }}
-    - name: Build unix port
-      run: make -C ports/unix VARIANT=coverage -j4
-    - name: Run tests
-      run: ./run-tests.py -j4 ${{ env[format('TEST_{0}', matrix.test)] }}
-      working-directory: tests
-    - name: Print failure info
-      run: ./run-tests.py -j4 --print-failures
-      if: failure()
-      working-directory: tests
-    - name: Build native modules
-      if: matrix.test == 'all'
-      run: |
-        make -C examples/natmod/features1
-        make -C examples/natmod/features2
-        make -C examples/natmod/heapq
-        make -C examples/natmod/random
-        make -C examples/natmod/re
-    - name: Test native modules
-      if: matrix.test == 'all'
-      run: ./run-natmodtests.py extmod/{heapq*,re*,zlib*}.py
-      working-directory: tests
+    - name: Build & test POSIX port
+      run: make -C ports/posix -j$(nproc) vtest