ci: migrate 9 of 12 workflow jobs to smithy self-hosted runners

.github/workflows/bench.yml

@@ -27,7 +27,7 @@ env:
 jobs:
   bench-smoke:
     name: Bench compile-only
-    runs-on: ubuntu-latest
+    runs-on: [self-hosted, linux, x64, rust-cpu]
     steps:
       - uses: actions/checkout@v4
 

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ env:
 jobs:
   test:
     name: Test
-    runs-on: ubuntu-latest
+    runs-on: [self-hosted, linux, x64, rust-cpu]
     steps:
       - uses: actions/checkout@v4
 
@@ -43,7 +43,7 @@ jobs:
 
   coverage:
     name: Coverage
-    runs-on: ubuntu-latest
+    runs-on: [self-hosted, linux, x64, rust-cpu]
     steps:
       - uses: actions/checkout@v4
 
@@ -79,7 +79,7 @@ jobs:
 
   clippy:
     name: Clippy
-    runs-on: ubuntu-latest
+    runs-on: [self-hosted, linux, x64, rust-cpu]
     steps:
       - uses: actions/checkout@v4
 
@@ -95,7 +95,7 @@ jobs:
 
   fmt:
     name: Format
-    runs-on: ubuntu-latest
+    runs-on: [self-hosted, linux, x64, light]
     steps:
       - uses: actions/checkout@v4
 

.github/workflows/fixtures.yml

@@ -13,7 +13,7 @@ env:
 jobs:
   update-fixtures:
     name: Generate wit-bindgen fixtures
-    runs-on: ubuntu-latest
+    runs-on: [self-hosted, linux, x64, rust-cpu]
     permissions:
       contents: write
       pull-requests: write

.github/workflows/fuzz.yml

@@ -29,7 +29,7 @@ env:
 jobs:
   fuzz-smoke:
     name: Fuzz smoke (${{ matrix.target }})
-    runs-on: ubuntu-latest
+    runs-on: [self-hosted, linux, x64, rust-cpu]
     continue-on-error: true
     strategy:
       fail-fast: false
@@ -46,6 +46,8 @@ jobs:
 
       - name: Install nightly Rust
         uses: dtolnay/rust-toolchain@nightly
+        with:
+          targets: x86_64-unknown-linux-musl
 
       - name: Install cargo-fuzz
         run: cargo install cargo-fuzz --locked

.github/workflows/release.yml

@@ -15,14 +15,18 @@ jobs:
       matrix:
         include:
           - target: x86_64-unknown-linux-gnu
-            runner: ubuntu-latest
+            runner: [self-hosted, linux, x64, rust-cpu]
             use_cross: false
+          # Stays on ubuntu-latest: `cross` launches a Docker container;
+          # podman-docker compat shim on smithy is untested for cross images.
           - target: aarch64-unknown-linux-gnu
             runner: ubuntu-latest
             use_cross: true
+          # Stays on macos-14: smithy is Linux x86_64 only.
           - target: x86_64-apple-darwin
             runner: macos-14
             use_cross: false
+          # Stays on macos-14: smithy is Linux x86_64 only.
           - target: aarch64-apple-darwin
             runner: macos-14
             use_cross: false
@@ -58,7 +62,7 @@ jobs:
   release:
     name: Release
     needs: build
-    runs-on: ubuntu-latest
+    runs-on: [self-hosted, linux, x64, light]
     permissions:
       contents: write
     steps: