Use caching mechanism built-in to the setup-node action

The `setup-node` action now supports caching. We can replace old caching
mechanism with the mechanism offered by the action.

Author: michalinacienciala

.github/workflows/initcontainer.yml

@@ -32,23 +32,8 @@ jobs:
       - uses: actions/setup-node@v2
         with:
           node-version: "14.x"
-
-      # In the future we could switch to using cache functionality built-in to
-      # the `setup-node` action. Right now the functionality does not support
-      # cases when package.json resides outside of the root directory, but there's
-      # an open issue (https://github.com/actions/setup-node/issues/275) in the
-      # works for that.
-      - name: Cache node modules
-        uses: actions/cache@v2
-        env:
-          cache-name: cache-solidity-node-modules
-        with:
-          path: ~/.npm # npm cache files are stored in `~/.npm` on Linux/macOS
-          key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/package-lock.json') }}
-          restore-keys: |
-            ${{ runner.os }}-build-${{ env.cache-name }}-
-            ${{ runner.os }}-build-
-            ${{ runner.os }}-
+          cache: "npm"
+          cache-dependency-path: infrastructure/kube/templates/keep-ecdsa/initcontainer/provision-keep-ecdsa/package-lock.json
 
       - name: Get upstream packages' versions
         uses: keep-network/ci/actions/upstream-builds-query@v1

.github/workflows/npm.yml

@@ -22,20 +22,10 @@ jobs:
       - uses: actions/setup-node@v2
         with:
           node-version: "14.x"
+          cache: "npm"
+          cache-dependency-path: solidity/package-lock.json
           registry-url: "https://registry.npmjs.org"
 
-      - name: Cache node modules
-        uses: actions/cache@v1
-        env:
-          cache-name: cache-solidity-node-modules
-        with:
-          path: ~/.npm # npm cache files are stored in `~/.npm` on Linux/macOS
-          key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/package-lock.json') }}
-          restore-keys: |
-            ${{ runner.os }}-build-${{ env.cache-name }}-
-            ${{ runner.os }}-build-
-            ${{ runner.os }}-
-
       - name: Install dependencies
         run: npm ci
 

.github/workflows/staker-rewards.yml

@@ -42,18 +42,8 @@ jobs:
       - uses: actions/setup-node@v2
         with:
           node-version: "14.x"
-
-      - name: Cache node modules
-        uses: actions/cache@v2
-        env:
-          cache-name: cache-solidity-node-modules
-        with:
-          path: ~/.npm # npm cache files are stored in `~/.npm` on Linux/macOS
-          key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/package-lock.json') }}
-          restore-keys: |
-            ${{ runner.os }}-build-${{ env.cache-name }}-
-            ${{ runner.os }}-build-
-            ${{ runner.os }}-
+          cache: "npm"
+          cache-dependency-path: staker-rewards/package-lock.json
 
       - name: Install dependencies
         run: npm ci