ci: Temporarily disable riscv32imc-esp-espidf build

Author: taiki-e

.github/workflows/ci.yml

@@ -65,9 +65,10 @@ jobs:
       - name: Add rust-src
         if: startsWith(matrix.rust, 'nightly')
         run: rustup component add rust-src
-      - name: Check selected Tier 3 targets
-        if: startsWith(matrix.rust, 'nightly') && matrix.os == 'ubuntu-latest'
-        run: cargo check -Z build-std --target=riscv32imc-esp-espidf
+      # TODO: broken due to https://github.com/rust-lang/rust/pull/119026.
+      # - name: Check selected Tier 3 targets
+      #   if: startsWith(matrix.rust, 'nightly') && matrix.os == 'ubuntu-latest'
+      #   run: cargo check -Z build-std --target=riscv32imc-esp-espidf
       - name: Check haiku
         if: startsWith(matrix.rust, 'nightly') && matrix.os == 'ubuntu-latest'
         run: cargo check -Z build-std --target x86_64-unknown-haiku