Use python3 in CI

Author: me-no-dev

Diff for: .github/workflows/push.yml

@@ -19,6 +19,9 @@ jobs:
 
     steps:
     - uses: actions/checkout@v1
+    - uses: actions/setup-python@v1
+      with:
+        python-version: '3.x'
     - name: Build Sketches
       run: bash ./.github/scripts/on-push.sh ${{ matrix.chunk }} 15
 
@@ -32,6 +35,9 @@ jobs:
 
     steps:
     - uses: actions/checkout@v1
+    - uses: actions/setup-python@v1
+      with:
+        python-version: '3.x'
     - name: Build Sketches
       run: bash ./.github/scripts/on-push.sh
 
@@ -45,5 +51,8 @@ jobs:
 
     steps:
     - uses: actions/checkout@v1
+    - uses: actions/setup-python@v1
+      with:
+        python-version: '3.x'
     - name: Build Sketches
       run: bash ./.github/scripts/on-push.sh 1 1 #equal and non-zero to trigger PIO

Diff for: .github/workflows/release.yml

@@ -11,6 +11,9 @@ jobs:
 
     steps:
     - uses: actions/checkout@master
+    - uses: actions/setup-python@v1
+      with:
+        python-version: '3.x'
     - name: Build Release
       env:
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}