Use julia-actions/cache in CI

The advantage is that the whole depot will be cached instead of just the
artifacts. Also deleted the build step since Distributed doesn't have a build.jl
file.

Author: JamesWrigley

.github/workflows/ci.yml

@@ -14,6 +14,7 @@ concurrency:
   # Cancel intermediate builds: only pull request builds
   group: ${{ github.workflow }}-${{ github.ref }}-${{ github.ref != 'refs/heads/main' || startsWith(github.ref, 'refs/heads/release-') || github.run_number }}
   cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
+
 jobs:
   test:
     name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ github.event_name }}
@@ -39,17 +40,7 @@ jobs:
         with:
           version: ${{ matrix.version }}
           arch: ${{ matrix.arch }}
-      - uses: actions/cache@v4
-        env:
-          cache-name: cache-artifacts
-        with:
-          path: ~/.julia/artifacts
-          key: ${{ runner.os }}-test-${{ env.cache-name }}-${{ hashFiles('**/Project.toml') }}
-          restore-keys: |
-            ${{ runner.os }}-test-${{ env.cache-name }}-
-            ${{ runner.os }}-test-${{ matrix.os }}
-            ${{ runner.os }}-
-      - uses: julia-actions/julia-buildpkg@v1
+      - uses: julia-actions/cache@v2
       - uses: julia-actions/julia-runtest@v1
         env:
           JULIA_DISTRIBUTED_TESTING_STANDALONE: 1
@@ -58,6 +49,7 @@ jobs:
         with:
           files: lcov.info
           token: ${{ secrets.CODECOV_TOKEN }}
+
   docs:
     runs-on: ubuntu-latest
     steps: