[CI] set CMake minimum version requirement via env var for the break by CMake 4 (#1340)

Author: ThomsonTan

.github/workflows/build-ios-mac.yml

@@ -36,6 +36,8 @@ jobs:
           - os: macos-15
             simulator: "'iPad Pro (11-inch) (4th generation)'"
     runs-on: ${{ matrix.os }}
+    env:
+      CMAKE_POLICY_VERSION_MINIMUM: "3.5"
     steps:
     - name: Grant write permissions to /usr/local
       run: |

.github/workflows/build-posix-latest.yml

@@ -23,6 +23,8 @@ jobs:
   build:
 
     runs-on: ${{ matrix.os }}
+    env:
+      CMAKE_POLICY_VERSION_MINIMUM: "3.5"
     strategy:
       matrix:
         config: [release, debug]

.github/workflows/build-ubuntu-2004.yml

@@ -23,6 +23,8 @@ jobs:
   build:
 
     runs-on: ${{ matrix.os }}
+    env:
+      CMAKE_POLICY_VERSION_MINIMUM: "3.5"
     strategy:
       matrix:
         config: [release, debug]