Improve build time in CI through caching native modules (#482)

* Improve caching of hak native modules

* Avoid double-hashing

* Skip native installs where cache is hit

* Include Electron version in the hash, it affects the ABI

* Add missing step IDs

* Add comments

.github/workflows/build_prepare.yaml

@@ -26,6 +26,12 @@ jobs:
       - name: Fetch Element Web
         run: yarn run fetch --noverify -d ${{ inputs.config }} ${{ inputs.version }}
 
+      # We split this out to save the build_* scripts having to do it to make use of `hashFiles` in the cache action
+      - name: Generate cache hash files
+        run: |
+          yarn run --silent electron --version > electronVersion
+          cat package.json | jq -c .hakDependencies > hakDependencies.json
+
       - uses: actions/upload-artifact@v3
         with:
           name: webapp
@@ -33,3 +39,5 @@ jobs:
           path: |
             webapp.asar
             package.json
+            electronVersion
+            hakDependencies.json