Found the reason!

.github/workflows/ci.yml

@@ -96,35 +96,35 @@ jobs:
             target: aarch64-apple-darwin
           - os: windows-latest
             target: aarch64-pc-windows-msvc
-          - os: linux-latest
+          - os: ubuntu-latest
             target: aarch64-unknown-linux-musl
-          - os: linux-latest
+          - os: ubuntu-latest
             target: arm-unknown-linux-gnueabi
-          - os: linux-latest
+          - os: ubuntu-latest
             target: arm-unknown-linux-gnueabihf
-          - os: linux-latest
+          - os: ubuntu-latest
             target: armv7-unknown-linux-gnueabihf
-          - os: linux-latest
+          - os: ubuntu-latest
             target: loongarch64-unknown-linux-gnu
-          - os: linux-latest
+          - os: ubuntu-latest
             target: mips-unknown-linux-gnu
-          - os: linux-latest
+          - os: ubuntu-latest
             target: mips64-unknown-linux-gnuabi64
-          - os: linux-latest
+          - os: ubuntu-latest
             target: mips64el-unknown-linux-gnuabi64
-          - os: linux-latest
+          - os: ubuntu-latest
             target: mipsel-unknown-linux-gnu
-          - os: linux-latest
+          - os: ubuntu-latest
             target: powerpc-unknown-linux-gnu
-          - os: linux-latest
+          - os: ubuntu-latest
             target: powerpc64-unknown-linux-gnu
-          - os: linux-latest
+          - os: ubuntu-latest
             target: powerpc64le-unknown-linux-gnu
-          - os: linux-latest
+          - os: ubuntu-latest
             target: riscv64gc-unknown-linux-gnu
-          - os: linux-latest
+          - os: ubuntu-latest
             target: s390x-unknown-linux-gnu
-          - os: linux-latest
+          - os: ubuntu-latest
             target: x86_64-unknown-linux-musl
     steps:
       - uses: actions/checkout@v1
@@ -149,7 +149,7 @@ jobs:
     # See https://doc.rust-lang.org/nightly/rustc/platform-support.html#tier-2-with-host-tools
     name: Tier 2 (with Host Tools, via Cross)
     needs: tier1
-    runs-on: linux-latest
+    runs-on: ubuntu-latest
     strategy:
       matrix:
         target:
@@ -185,67 +185,67 @@ jobs:
         include:
           - os: macos-latest
             target: aarch64-apple-ios
-          - os: linux-latest
+          - os: ubuntu-latest
             target: aarch64-unknown-fuchsia
-          - os: linux-latest
+          - os: ubuntu-latest
             target: aarch64-linux-android
-          - os: linux-latest
+          - os: ubuntu-latest
             target: arm-linux-androideabi
-          - os: linux-latest
+          - os: ubuntu-latest
             target: arm-unknown-linux-musleabi
-          - os: linux-latest
+          - os: ubuntu-latest
             target: arm-unknown-linux-musleabihf
-          - os: linux-latest
+          - os: ubuntu-latest
             target: armv5te-unknown-linux-gnueabi
-          - os: linux-latest
+          - os: ubuntu-latest
             target: armv5te-unknown-linux-musleabi
-          - os: linux-latest
+          - os: ubuntu-latest
             target: armv7-linux-androideabi
-          - os: linux-latest
+          - os: ubuntu-latest
             target: armv7-unknown-linux-gnueabi
-          - os: linux-latest
+          - os: ubuntu-latest
             target: armv7-unknown-linux-musleabi
-          - os: linux-latest
+          - os: ubuntu-latest
             target: armv7-unknown-linux-musleabihf
-          - os: linux-latest
+          - os: ubuntu-latest
             target: i586-unknown-linux-gnu
-          - os: linux-latest
+          - os: ubuntu-latest
             target: i586-unknown-linux-musl
-          - os: linux-latest
+          - os: ubuntu-latest
             target: i686-linux-android
-          - os: linux-latest
+          - os: ubuntu-latest
             target: i686-unknown-freebsd
-          - os: linux-latest
+          - os: ubuntu-latest
             target: i686-unknown-linux-musl
-          - os: linux-latest
+          - os: ubuntu-latest
             target: mips-unknown-linux-musl
-          - os: linux-latest
+          - os: ubuntu-latest
             target: mips64-unknown-linux-muslabi64
-          - os: linux-latest
+          - os: ubuntu-latest
             target: mips64el-unknown-linux-muslabi64
-          - os: linux-latest
+          - os: ubuntu-latest
             target: mipsel-unknown-linux-musl
-          - os: linux-latest
+          - os: ubuntu-latest
             target: sparc64-unknown-linux-gnu
-          - os: linux-latest
+          - os: ubuntu-latest
             target: sparcv9-sun-solaris
-          - os: linux-latest
+          - os: ubuntu-latest
             target: thumbv7neon-linux-androideabi
-          - os: linux-latest
+          - os: ubuntu-latest
             target: thumbv7neon-unknown-linux-gnueabihf
           - os: macos-latest
             target: x86_64-apple-ios
-          - os: linux-latest
+          - os: ubuntu-latest
             target: x86_64-fortanix-unknown-sgx
-          - os: linux-latest
+          - os: ubuntu-latest
             target: x86_64-unknown-fuchsia
-          - os: linux-latest
+          - os: ubuntu-latest
             target: x86_64-linux-android
-          - os: linux-latest
+          - os: ubuntu-latest
             target: x86_64-pc-solaris
-          - os: linux-latest
+          - os: ubuntu-latest
             target: x86_64-unknown-linux-gnux32
-          - os: linux-latest
+          - os: ubuntu-latest
             target: x86_64-unknown-redox
     steps:
       - uses: actions/checkout@v1