Alternate option: just cache the results, rebuild when new commits

.github/workflows/ci.yml

@@ -23,33 +23,16 @@ jobs:
           git clone https://github.com/eclipse-zenoh/zenoh-c.git
           cd zenoh-c && git rev-parse HEAD > .gh_head_rev && cat .gh_head_rev
 
-      - name: Cached rust + c build
-        uses: Swatinem/rust-cache@v2
+      - name: Cache compiled zenoh-c library
+        id: cache-libzenohc
+        uses: actions/cache@v4
         with:
-          #shared-key: zenohc
-          key: ${{ hashFiles('zenoh-c/.gh_head_rev') }}
-          workspaces: |
-            zenoh-c
-          cache-directories: |
-            zenoh-c/build
-
-#     - name: Cached Cargo files
-#       uses: actions/cache@v4
-#       with:
-#         key: zenohc-cargo-${{ hashFiles('zenoh-c/.gh_head_rev') }}
-#         restore-keys: |
-#           zenohc-cargo-
-#         path: |
-#           ~/.cargo
-
-#     - name: Cached Zenoh-C build
-#       uses: actions/cache@v4
-#       with:
-#         key: zenohc-${{ hashFiles('zenoh-c/.gh_head_rev') }}
-#         path: |
-#           zenoh-c/build
+          key: libzenohc-${{ hashFiles('zenoh-c/.gh_head_rev') }}
+          path: |
+            ~/local
 
       - name: Build and install Zenoh-C
+        if: ${{ steps.cache-libzenohc.outputs.cache-hit != 'true' }}
         shell: bash
         run: |
           cd zenoh-c