Concurrency for build job (#4997)

Author: newhoggy

.github/workflows/haskell-linux.yml

@@ -25,8 +25,29 @@ jobs:
       # current ref from: 27.02.2022
       SECP256K1_REF: ac83be33d0956faf6b7f61a60ab524ef7d6a473a
 
+    concurrency:
+      group: >
+        a+${{ github.event_name }}
+        b+${{ github.workflow_ref }}
+        c+${{ github.job }}
+        d+${{ matrix.ghc }}
+        e+${{ matrix.cabal }}
+        f+${{ matrix.os }}
+        g+${{ (startsWith(github.ref, 'refs/heads/gh-readonly-queue/') && github.run_id) || github.event.pull_request.number || github.ref }}
+      cancel-in-progress: true
 
     steps:
+    - name: Concurrency group
+      run: >
+        echo
+        a+${{ github.event_name }}
+        b+${{ github.workflow_ref }}
+        c+${{ github.job }}
+        d+${{ matrix.ghc }}
+        e+${{ matrix.cabal }}
+        f+${{ matrix.os }}
+        g+${{ (startsWith(github.ref, 'refs/heads/gh-readonly-queue/') && github.run_id) || github.event.pull_request.number || github.ref }}
+
     - name: Workaround runner image issue
       # https://github.com/actions/runner-images/issues/7061
       run: sudo chown -R $USER /usr/local/.ghcup

.github/workflows/haskell.yml

@@ -25,7 +25,29 @@ jobs:
       # current ref from: 27.02.2022
       SECP256K1_REF: ac83be33d0956faf6b7f61a60ab524ef7d6a473a
 
+    concurrency:
+      group: >
+        a+${{ github.event_name }}
+        b+${{ github.workflow_ref }}
+        c+${{ github.job }}
+        d+${{ matrix.ghc }}
+        e+${{ matrix.cabal }}
+        f+${{ matrix.os }}
+        g+${{ (startsWith(github.ref, 'refs/heads/gh-readonly-queue/') && github.run_id) || github.event.pull_request.number || github.ref }}
+      cancel-in-progress: true
+
     steps:
+    - name: Concurrency group
+      run: >
+        echo
+        a+${{ github.event_name }}
+        b+${{ github.workflow_ref }}
+        c+${{ github.job }}
+        d+${{ matrix.ghc }}
+        e+${{ matrix.cabal }}
+        f+${{ matrix.os }}
+        g+${{ (startsWith(github.ref, 'refs/heads/gh-readonly-queue/') && github.run_id) || github.event.pull_request.number || github.ref }}
+
     - name: Install Haskell
       uses: input-output-hk/setup-haskell@v1
       id: setup-haskell