diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c2ac64d57..37fef7077 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,9 +1,12 @@
 name: CI
 
-on: [push, pull_request]
+on:
+  push:
+    branches: [master]
+  pull_request:
 
 concurrency:
-  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.run_id }}
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
   cancel-in-progress: true
 
 jobs:
@@ -40,7 +43,6 @@ jobs:
           - { name: 'MSVC (x64)',          os: 'windows-latest', generator: 'Ninja',                 dx5: false, config: true,  msvc: true,  werror: false,  clang-tidy: false,   vc-arch: 'amd64' }
           - { name: 'MSVC (x64 Debug)',    os: 'windows-latest', generator: 'Ninja',                 dx5: false, config: true,  msvc: true,  werror: false,  clang-tidy: false,   vc-arch: 'amd64',   debug: true }
           - { name: 'MSVC (arm64)',        os: 'windows-latest', generator: 'Ninja',                 dx5: false, config: false, msvc: true,  werror: false,  clang-tidy: false,  vc-arch: 'amd64_arm64' }
-          - { name: 'msys2 mingw32',       os: 'windows-latest', generator: 'Ninja',                 dx5: false, config: false, mingw: true, werror: true,   clang-tidy: true,   msystem: 'mingw32', msys-env: 'mingw-w64-i686',   shell: 'msys2 {0}' }
           - { name: 'msys2 mingw64',       os: 'windows-latest', generator: 'Ninja',                 dx5: false, config: true,  mingw: true, werror: true,   clang-tidy: true,   msystem: 'mingw64', msys-env: 'mingw-w64-x86_64', shell: 'msys2 {0}' }
           - { name: 'macOS',               os: 'macos-latest',   generator: 'Ninja',                 dx5: false, config: true,  brew: true,  werror: true,   clang-tidy: false }
           - { name: 'iOS',                 os: 'macos-15',       generator: 'Xcode',                 dx5: false, config: false, brew: true,  werror: true,   clang-tidy: false,  cmake-args: '-DCMAKE_SYSTEM_NAME=iOS', ios: true }