first cut at API checking

API files should be initialized now, modulo stray BOMs.

.github/workflows/check-api.yml

@@ -47,17 +47,15 @@ jobs:
 
       # I was going to use the canned action, but it only supports a single package and reinstalls the same binary each time
       - name: Install print-api
-        shell: bash
         run: |
           wget -q https://github.com/Kleidukos/print-api/releases/download/v0.1.0.1/print-api-0.1.0.1-Linux-static-${{ matrix.ghc }}-x86_64.tar.gz
           tar -xzvf print-api-0.1.0.1-Linux-static-${{ matrix.ghc }}-x86_64.tar.gz
           chmod +x print-api
 
       # print-api needs environment files. It also doesn't make a lot of sense to use the cached builds, sadly,
-      # since they're special in different ways (bootstrap and validate) and we want a vanulla build. And there
+      # since they're special in different ways (bootstrap and validate) and we want a vanilla build. And there
       # isn't enough cache space to make a third cache, even though this is a very limited build.
       - name: Build Cabal with environment files
-        shell: bash
         run: cabal build Cabal-syntax Cabal --write-ghc-environment-files=always --project-file=cabal.release.project
 
       - name: Check Cabal-syntax and Cabal APIs
@@ -66,3 +64,15 @@ jobs:
           ./print-api --package-name Cabal > Cabal.api
           diff Cabal-syntax.api Cabal-syntax/Cabal-syntax-${{ matrix.ghc }}-${{ matrix.sys.os }}.api
           diff Cabal.api Cabal/Cabal-${{ matrix.ghc }}-${{ matrix.sys.os }}.api
+
+      # for convenience, since large changes would be a pain to reconstruct from diffs and
+      # contributors aren't guaranteed to have ubuntu-latest handy
+      - uses: actions/upload-artifact@v3
+        with:
+          name: Cabal-syntax.api
+          path: Cabal-syntax.api
+
+      - uses: actions/upload-artifact@v3
+        with:
+          name: Cabal.api
+          path: Cabal.api