Add github workflow for toolchain consistency check

Implements #308

Author: dario23

.github/workflows/toolchain-version.yml

@@ -0,0 +1,15 @@
+name: Toolchain version consistency
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+jobs:
+  version_consistency_check:
+    name: Toolchain version consistency check
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Run check
+        run: scripts/toolchain-version -c
+