Add Rebar cache step

Author: jgarber623-cargosense

action.yml

@@ -98,6 +98,14 @@ runs:
         restore-keys: |
           hex-${{ steps.set-shared-cache-key.outputs.shared-cache-key }}-
 
+    - name: Restore Rebar build tool cache
+      uses: actions/cache@v5
+      with:
+        path: ~/.cache/rebar3
+        key: rebar3-${{ steps.set-shared-cache-key.outputs.shared-cache-key }}-${{ hashFiles('**/mix.lock') }}
+        restore-keys: |
+          rebar3-${{ steps.set-shared-cache-key.outputs.shared-cache-key }}-
+
     - name: Install Hex package manager
       if: inputs.install-hex == 'true'
       run: mix local.hex --force