(hopefully) resolve build and release issues (#11)

* Test github build only on ubuntu

* Downgrade NodeJS to 13 to match electron ver

* Node=v14 and upgrade packages

* Only build, and on all platforms

* Install deps before build

* Disable releasing

* Reactivate release build but only on master

.github/workflows/build.yml

@@ -1,6 +1,9 @@
 name: Build/release
 
-on: push
+on:
+  push:
+    branches:
+      - master
 
 jobs:
   release:
@@ -9,6 +12,7 @@ jobs:
     strategy:
       matrix:
         os: [macos-latest, ubuntu-latest, windows-latest]
+        # os: [ubuntu-latest]
 
     steps:
       - name: Check out Git repository
@@ -17,15 +21,14 @@ jobs:
       - name: Install Node.js, NPM and Yarn
         uses: actions/setup-node@v1
         with:
-          node-version: 13
+          node-version: 14
 
       - name: Build/release Electron app
         uses: samuelmeuli/action-electron-builder@v1
         with:
           # GitHub token, automatically provided to the action
           # (No need to define this secret in the repo settings)
           github_token: ${{ secrets.github_token }}
-
           # If the commit is tagged with a version (e.g. "v1.0.0"),
           # release the app after building
           release: ${{ startsWith(github.ref, 'refs/tags/v') }}