Try fixing the CI caching

.gitea/workflows/julia-package-ci.yml

@@ -2,6 +2,10 @@ name: MetagraphOptimization_CI
 
 on: [push]
 
+env:
+  # keep the depot directly in the repository for the cache
+  JULIA_DEPOT_PATH: './.julia'
+
 jobs:
   prepare:
     runs-on: arch-latest
@@ -30,18 +34,14 @@ jobs:
           patterns: |-
             **/Project.toml
 
-      - name: Print Runner Info
-        run: |
-          echo "Hash value: ${{ steps.get-hash.outputs.hash }}"
-
       - name: Restore Cache
         uses: actions/cache/restore@v3
         id: cache-restore
         with:
           path: |
-            /root/.julia/artifacts
-            /root/.julia/packages
-            /root/.julia/registries
+            .julia/artifacts
+            .julia/packages
+            .julia/registries
           key: julia-${{ steps.get-hash.outputs.hash }}
 
       - name: Check cache hit
@@ -58,9 +58,9 @@ jobs:
         uses: actions/cache/save@v3
         with:
           path: |
-            /root/.julia/artifacts
-            /root/.julia/packages
-            /root/.julia/registries
+            .julia/artifacts
+            .julia/packages
+            .julia/registries
           key: julia-${{ steps.get-hash.outputs.hash }}
 
   test:
@@ -95,12 +95,11 @@ jobs:
         uses: actions/cache/restore@v3
         with:
           path: |
-            /root/.julia/artifacts
-            /root/.julia/packages
-            /root/.julia/registries
+            .julia/artifacts
+            .julia/packages
+            .julia/registries
           key: julia-${{ steps.get-hash.outputs.hash }}
 
-      # TODO: Remove once the cache actually works
       - name: Install dependencies
         run: |
           julia --project=./        -e 'import Pkg; Pkg.instantiate(); Pkg.precompile()'
@@ -140,7 +139,7 @@ jobs:
         uses: https://github.com/julia-actions/setup-julia@v1.9.2
         with:
           version: '1.9.2'
-      
+
       # needed for the file hashing, should be removed when ${{ hashFiles('**/Project.toml') }} is supported in gitea
       - name: Setup go environment
         uses: actions/setup-go@v3
@@ -158,12 +157,11 @@ jobs:
         uses: actions/cache/restore@v3
         with:
           path: |
-            /root/.julia/artifacts
-            /root/.julia/packages
-            /root/.julia/registries
+            .julia/artifacts
+            .julia/packages
+            .julia/registries
           key: julia-${{ steps.get-hash.outputs.hash }}
 
-      # TODO: Remove once the cache actually works
       - name: Install dependencies
         run: |
           julia --project=./        -e 'import Pkg; Pkg.instantiate(); Pkg.precompile()'