Try to include at least one PyPy wheel

See
https://github.com/matrix-org/synapse/pull/15019#discussion_r1099993439
for details

.github/workflows/release-artifacts.yml

@@ -107,9 +107,9 @@ jobs:
           - ${{ startsWith(github.ref, 'refs/pull/') }}
 
         exclude:
-          # Don't build macos wheels on PR CI.
-          - is_pr: true
-            os: "macos-11"
+#          # Don't build macos wheels on PR CI.
+#          - is_pr: true
+#            os: "macos-11"
           # Don't build aarch64 wheels on mac.
           - os: "macos-11"
             arch: aarch64
@@ -139,16 +139,17 @@ jobs:
         if: matrix.arch == 'aarch64'
         run: echo 'CIBW_ARCHS_LINUX=aarch64' >> $GITHUB_ENV
 
-      - name: Only build a single wheel on PR
-        if: startsWith(github.ref, 'refs/pull/')
-        run: echo "CIBW_BUILD="cp37-manylinux_${{ matrix.arch }}"" >> $GITHUB_ENV
+#      - name: Only build a single wheel on PR
+#        if: startsWith(github.ref, 'refs/pull/')
+#        run: echo "CIBW_BUILD="cp37-manylinux_${{ matrix.arch }}"" >> $GITHUB_ENV
 
       - name: Build wheels
         run: python -m cibuildwheel --output-dir wheelhouse
         env:
           # Skip testing for platforms which various libraries don't have wheels
           # for, and so need extra build deps.
-          CIBW_TEST_SKIP: pp3*-* *i686* *musl*
+          # We try to include at least one PyPy wheel here.
+          CIBW_TEST_SKIP: pp3{7,8}-* *i686* *musl*
           # Fix Rust OOM errors on emulated aarch64: https://github.com/rust-lang/cargo/issues/10583
           CARGO_NET_GIT_FETCH_WITH_CLI: true
           CIBW_ENVIRONMENT_PASS_LINUX: CARGO_NET_GIT_FETCH_WITH_CLI