Some improvements to CI

Run only on linux usually and on all OS only during releases + run tests on all branches and on all PR

Author: jecisc

.github/workflows/release.yml

@@ -0,0 +1,27 @@
+name: CI
+
+env:
+  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+on:
+  release:
+    types: [created, edited]
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        smalltalk: [ Pharo64-9.0, Pharo64-10 ]
+        os: [ macos-latest, windows-latest, ubuntu-latest]
+    runs-on: ${{ matrix.os }}
+    name: ${{ matrix.smalltalk }} on ${{ matrix.os }}
+    env:
+      PROJECT_NAME: PolyMath-${{ matrix.smalltalk }}
+    steps:
+      - uses: actions/checkout@v2
+      - uses: hpi-swa/setup-smalltalkCI@v1
+        with:
+          smalltalk-version: ${{ matrix.smalltalk }}
+      - run: smalltalkci -s ${{ matrix.smalltalk }}
+        shell: bash
+        timeout-minutes: 15

.github/workflows/smalltalk-ci.yml

@@ -1,31 +1,29 @@
-name: CI matrix
+name: CI
+
+env:
+  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
 on:
   push:
-    branches: [ master ]
+    branches:
+      - '**'
   pull_request:
-    branches: [ master ]
-
-  # Allows you to run this workflow manually from the Actions tab
-  workflow_dispatch:
+    types: [assigned, opened, synchronize, reopened]
 
-# A workflow run is made up of one or more jobs that can run sequentially or in parallel
 jobs:
   build:
+    runs-on: ubuntu-latest
+    env:
+      PROJECT_NAME: PolyMath-${{ matrix.smalltalk }}
     strategy:
       matrix:
-        os: [ macos-latest, windows-latest, ubuntu-latest]
-        smalltalk: [ Pharo64-9.0, Pharo64-10]
-    runs-on: ${{ matrix.os }}
-    name: ${{ matrix.smalltalk }} on ${{ matrix.os }}
+        smalltalk: [ Pharo64-9.0, Pharo64-10 ]
+    name: ${{ matrix.smalltalk }}
     steps:
       - uses: actions/checkout@v2
-      - name: Setup smalltalkCI
-        uses: hpi-swa/setup-smalltalkCI@v1
+      - uses: hpi-swa/setup-smalltalkCI@v1
         with:
-          smalltalk-image: ${{ matrix.smalltalk }}
-      - name: Load Image and Run Tests
-        run: smalltalkci -s ${{ matrix.smalltalk }}
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        timeout-minutes: 15
+          smalltalk-version: ${{ matrix.smalltalk }}
+      - run: smalltalkci -s ${{ matrix.smalltalk }}
+        shell: bash
+        timeout-minutes: 15