Add new job to quickly build and run tests

The wheel-building job is too time consuming and therefore doesn't work
optimally to give feedback in a timely fashion. Moreover, it (currently)
doesn't properly test the compiled C extension, which is our usual
source of problems.

This new workflow defines jobs for common platforms and python versions
to build and test our package. These jobs run all in parallel, with each
one being fairly small, and therefore should give us quick feedback
after a commit is pushed. It also includes testing against the latest
version of PyPy (that includes our fixes), thus ensuring our extension
keeps working against this Python distribution.

Signed-off-by: Rodrigo Tobar <rtobar@icrar.org>

.github/workflows/deploy-to-pypi.yml

@@ -1,4 +1,4 @@
-name: Build, test, and upload to PyPI
+name: Build distributions and upload to PyPI
 
 # Build on every branch push, tag push, and pull request change:
 on: [push, pull_request]

.github/workflows/fast-built-and-test.yml

@@ -0,0 +1,47 @@
+name: Build and test ijson
+
+# Build on every branch push, tag push, and pull request change:
+on: [push, pull_request]
+
+jobs:
+
+  fast_tests:
+    name: Build ijson and run unit tests (${{ matrix.os }}, ${{ matrix.python_version }})
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-20.04, windows-2019, macos-12]
+        python_version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
+        include:
+          - os: ubuntu-20.04
+            python_version: "pypy3.9"
+          - os: ubuntu-20.04
+            python_version: "pypy3.10"
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: true
+
+      - uses: actions/setup-python@v4
+        name: Install Python
+        with:
+          python-version: ${{ matrix.python_version }}
+
+      - name: Install build test dependencies
+        run: pip install setuptools
+
+      - name: Install Yajl
+        if: ${{ matrix.os == 'ubuntu-20.04' }}
+        run: sudo apt install libyajl-dev
+
+      - name: Build ijson
+        env:
+          IJSON_EMBED_YAJL: ${{ matrix.os != 'ubuntu-20.04' && '1' || '0' }}
+        run: python setup.py develop
+
+      - name: Install test dependencies
+        run: pip install pytest cffi
+
+      - name: Run tests
+        run: pytest -vv