ci: cache only 'node_modules' without 'out'

Source code files ('.ts') depends on multiple files (not only .ts files,
but package.json, tsconfig.json, etc...), so in order not to complicate
things a lot we just build src files again.

Author: ashenBlade

.github/workflows/testing.yml

@@ -15,11 +15,25 @@ jobs:
       with:
         node-version: '20.x'
         cache: 'npm'
-    - name: Build extension
+    - name: Restore node_modules from cache
+      id: restore-node-modules
+      uses: actions/cache/restore@v4
+      with:
+        path: node_modules
+        key: node_modules-${{ hashFiles('package-lock.json') }}
+    - name: Install node_modules
+      if: steps.restore-node-modules.outputs.cache-hit != 'true'
       run: |
         npm i
         npm i -D
-        npm run compile
+    - name: Store node_modules to cache
+      uses: actions/cache/save@v4
+      if: steps.restore-node-modules.outputs.cache-hit != 'true'
+      with:
+        path: node_modules
+        key: ${{ steps.restore-node-modules.outputs.cache-primary-key }}
+    - name: Build extension
+      run: npm run compile
     - name: Run linter
       run: npm run lint
 
@@ -33,14 +47,14 @@ jobs:
     steps:
     - name: Setup repository
       uses: actions/checkout@v4
-    - name: Restore cache
+    - name: Restore node_modules
       uses: actions/cache/restore@v4
       with:
-        path: |
-            node_modules
-            out
-        key: cache-${{ runner.os }}-${{ hashFiles('src/**/*.ts') }}
+        path: node_modules
+        key: node_modules-${{ hashFiles('package-lock.json') }}
         fail-on-cache-miss: true
+    - name: Build extension
+      run: npm run compile
     - name: Setup NodeJS
       uses: actions/setup-node@v4
       with: