Merge pull request #626 from frstrtr/ci-steward/ci-concurrency-groups

ci: per-ref concurrency (cancel-in-progress) on build, CodeQL, coin-matrix

Author: frstrtr

.github/workflows/build.yml

@@ -7,6 +7,15 @@ on:
   pull_request:
     branches: [master, btc-embedded, dash-spv-embedded, dgb/**]
 
+# Concurrency: a newer run on the same ref cancels the stale in-progress
+# one, cutting concurrent load on the shared self-hosted pool (the OOM/
+# oversubscription root cause, not just queue depth). Per-ref group so
+# distinct PRs/branches never cancel each other.
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+
 jobs:
   # ════════════════════════════════════════════════════════════════════════════
   # Test-allowlist drift-guard (fast, no build): every per-coin test executable

.github/workflows/codeql-analysis.yml

@@ -8,6 +8,15 @@ on:
   schedule:
     - cron: '30 1 * * 1'   # Weekly on Monday 01:30 UTC
 
+# Concurrency: a newer run on the same ref cancels the stale in-progress
+# one, cutting concurrent load on the shared self-hosted pool (the OOM/
+# oversubscription root cause, not just queue depth). Per-ref group so
+# distinct PRs/branches never cancel each other.
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+
 jobs:
   analyze:
     name: Analyze (${{ matrix.language }})

.github/workflows/coin-matrix.yml

@@ -17,6 +17,15 @@ on:
   pull_request:
     branches: [master, btc-embedded, dash-spv-embedded, dgb/slice4-skeleton, dgb/pool-pillars-port]
 
+# Concurrency: a newer run on the same ref cancels the stale in-progress
+# one, cutting concurrent load on the shared self-hosted pool (the OOM/
+# oversubscription root cause, not just queue depth). Per-ref group so
+# distinct PRs/branches never cancel each other.
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+
 jobs:
   coin:
     name: ${{ matrix.coin }} smoke (Linux x86_64)