Disable nightly toolchain in CI configuration

Until swiftlang/swift@b219d40 is tagged, CI with nightly snapshots off `main` keeps crashing.

Author: MaxDesiatov

.github/workflows/main.yml

@@ -137,12 +137,14 @@ jobs:
             wasi-swift-sdk-checksum: "b64dfad9e1c9ccdf06f35cf9b1a00317e000df0c0de0b3eb9f49d6db0fcba4d9"
             test-args: "--traits WasmDebuggingSupport --enable-code-coverage"
             build-dev-dashboard: true
-          - swift: "swiftlang/swift:nightly-main-noble"
-            development-toolchain-download: "https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT-SNAPSHOT-2025-10-02-a/swift-DEVELOPMENT-SNAPSHOT-2025-10-02-a-ubuntu24.04.tar.gz"
-            wasi-swift-sdk-download: "https://download.swift.org/development/wasm-sdk/swift-DEVELOPMENT-SNAPSHOT-2025-10-02-a/swift-DEVELOPMENT-SNAPSHOT-2025-10-02-a_wasm.artifactbundle.tar.gz"
-            wasi-swift-sdk-id: swift-DEVELOPMENT-SNAPSHOT-2025-10-02-a_wasm
-            wasi-swift-sdk-checksum: "b64dfad9e1c9ccdf06f35cf9b1a00317e000df0c0de0b3eb9f49d6db0fcba4d9"
-            test-args: "--traits WasmDebuggingSupport -Xswiftc -DWASMKIT_CI_TOOLCHAIN_NIGHTLY"
+            # Disabled until a toolchain containing https://github.com/swiftlang/swift/commit/b219d4089c922ceb8b700424236ca97f6087a9a1
+            # is tagged.
+          # - swift: "swiftlang/swift:nightly-main-noble"
+          #   development-toolchain-download: "https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT-SNAPSHOT-2025-10-02-a/swift-DEVELOPMENT-SNAPSHOT-2025-10-02-a-ubuntu24.04.tar.gz"
+          #   wasi-swift-sdk-download: "https://download.swift.org/development/wasm-sdk/swift-DEVELOPMENT-SNAPSHOT-2025-10-02-a/swift-DEVELOPMENT-SNAPSHOT-2025-10-02-a_wasm.artifactbundle.tar.gz"
+          #   wasi-swift-sdk-id: swift-DEVELOPMENT-SNAPSHOT-2025-10-02-a_wasm
+          #   wasi-swift-sdk-checksum: "b64dfad9e1c9ccdf06f35cf9b1a00317e000df0c0de0b3eb9f49d6db0fcba4d9"
+          #   test-args: "--traits WasmDebuggingSupport -Xswiftc -DWASMKIT_CI_TOOLCHAIN_NIGHTLY"
 
     runs-on: ubuntu-24.04
     name: "build-linux (${{ matrix.swift }})"