add suggestion to use cache action if no depot is detected (#41)

.github/workflows/ci.yml

@@ -58,18 +58,9 @@ jobs:
           version: ${{ matrix.version }}
           arch: ${{ matrix.arch }}
 
-      - uses: actions/cache@v3
-        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-
-            ${{ runner.os }}-
-
       - uses: ./.github/actions/julia-buildpkg
+        with:
+          ignore-no-cache: true
         env:
           JULIA_PKG_SERVER: ${{ matrix.pkg-server }}
 

action.yml

@@ -21,6 +21,9 @@ inputs:
     description: 'Determine if Pkg uses the cli git executable (Julia >= 1.7). Might be necessary for more complicated SSH setups.
                   Options: true | false. Default : false'
     default: 'false'
+  ignore-no-cache:
+    description: 'Whether to ignore if there appears to be no depot caching. Silences an action notice recommending `julia-actions/cache`.'
+    default: 'false'
 
 runs:
   using: 'composite'
@@ -29,6 +32,9 @@ runs:
     run: echo "JULIA_PKG_SERVER_REGISTRY_PREFERENCE=${JULIA_PKG_SERVER_REGISTRY_PREFERENCE:-eager}" >> ${GITHUB_ENV}
     shell: bash
   - run: |
+      if "${{ inputs.ignore-no-cache }}" == "false" && !isdir(DEPOT_PATH[1])
+          println("::notice title=[julia-buildpkg] Caching of the julia depot was not detected ::Consider using `julia-actions/cache` to speed up runs https://github.com/julia-actions/cache. To ignore, set input `ignore-no-cache: true` ")
+      end
       import Pkg
 
       # Determine if Pkg uses git-cli executable instead of LibGit2