[CI] Do not cancel unfinished jobs on master branch (#147)

Author: aobolensk

.github/workflows/main.yml

@@ -8,7 +8,7 @@ on:
   workflow_dispatch:
 
 concurrency:
-  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.sha }}
   cancel-in-progress: true
 
 jobs:

.github/workflows/static-analysis-pr.yml

@@ -3,7 +3,7 @@ name: Static analysis
 on: [pull_request]
 
 concurrency:
-  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.sha }}
   cancel-in-progress: true
 
 jobs:

.github/workflows/static-analysis.yml

@@ -3,7 +3,7 @@ name: Static analysis
 on: [push, pull_request]
 
 concurrency:
-  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.sha }}
   cancel-in-progress: true
 
 jobs: