chore: Workaround for CI build errors on arm64 (#5717)

CI builds with `clang-20` on `linux/arm64` are failing due to boost 1.86. This is hopefully fixed in version 1.88.

.github/scripts/strategy-matrix/generate.py

@@ -123,6 +123,10 @@ def generate_strategy_matrix(all: bool, architecture: list[dict], os: list[dict]
         if os['distro_name'] == 'rhel' and architecture['platform'] == 'linux/arm64':
             continue
 
+        # We skip all clang-20 on arm64 due to boost 1.86 build error
+        if f'{os['compiler_name']}-{os['compiler_version']}' == 'clang-20' and architecture['platform'] == 'linux/arm64':
+            continue
+
         # Generate a unique name for the configuration, e.g. macos-arm64-debug
         # or debian-bookworm-gcc-12-amd64-release-unity.
         config_name = os['distro_name']

.gitignore

@@ -110,4 +110,4 @@ bld.rippled/
 .vscode
 
 # Suggested in-tree build directory
-/.build/
+/.build*/