Add coverage to CI

Also updated the `julia-actions/cache` version.

Author: JamesWrigley

.github/workflows/CI.yml

@@ -21,12 +21,18 @@ jobs:
           - os: ubuntu-latest
             julia-arch: x86
             julia-version: '1'
+
     steps:
       - uses: actions/checkout@v4
       - uses: julia-actions/setup-julia@v2
         with:
           version: ${{ matrix.julia-version }}
           arch: ${{ matrix.julia-arch }}
-      - uses: julia-actions/cache@v1
+      - uses: julia-actions/cache@v2
       - uses: julia-actions/julia-buildpkg@v1
       - uses: julia-actions/julia-runtest@v1
+      - uses: julia-actions/julia-processcoverage@v1
+      - uses: codecov/codecov-action@v5
+        with:
+          files: lcov.info
+          token: ${{ secrets.CODECOV_TOKEN }}