ci: install stable Rust toolchain before building the package

Co-authored-by: Codesmith <codesmith-bot@users.noreply.github.com>

.github/actions/setup-rust-toolchain/action.yml

@@ -0,0 +1,17 @@
+name: "Set up Rust toolchain"
+description: >-
+  Install the latest stable Rust toolchain and make it the default. Installing
+  the litellm package builds litellm-rust through maturin, and the crates
+  pinned in litellm-rust/Cargo.lock require a newer rustc than some runner
+  images ship by default, which fails the build with "rustc <version> is not
+  supported by the following packages". Pull stable explicitly instead of
+  relying on whatever rustc the image happens to default to.
+
+runs:
+  using: composite
+  steps:
+    - name: Install stable Rust toolchain
+      shell: bash
+      run: |
+        rustup toolchain install stable --profile minimal
+        rustup default stable

.github/workflows/_test-unit-base.yml

@@ -62,6 +62,9 @@ jobs:
         with:
           python-version: "3.12"
 
+      - name: Set up Rust toolchain
+        uses: ./.github/actions/setup-rust-toolchain
+
       - name: Set up uv
         uses: ./.github/actions/setup-uv-with-retries
         with:

.github/workflows/auto_update_price_and_context_window.yml

@@ -17,6 +17,8 @@ jobs:
       - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
         with:
           persist-credentials: false
+      - name: Set up Rust toolchain
+        uses: ./.github/actions/setup-rust-toolchain
       - name: Set up uv
         uses: ./.github/actions/setup-uv-with-retries
         with:

.github/workflows/check-ui-api-types.yml

@@ -30,6 +30,9 @@ jobs:
         with:
           python-version: "3.12"
 
+      - name: Set up Rust toolchain
+        uses: ./.github/actions/setup-rust-toolchain
+
       - name: Set up uv
         uses: ./.github/actions/setup-uv-with-retries
         with:

.github/workflows/codspeed.yml

@@ -12,6 +12,7 @@ on:
       - "uv.lock"
       - ".github/workflows/codspeed.yml"
       - ".github/actions/setup-uv-with-retries/**"
+      - ".github/actions/setup-rust-toolchain/**"
   pull_request:
     branches:
       - main
@@ -23,6 +24,7 @@ on:
       - "uv.lock"
       - ".github/workflows/codspeed.yml"
       - ".github/actions/setup-uv-with-retries/**"
+      - ".github/actions/setup-rust-toolchain/**"
   # Allow CodSpeed to trigger backtest performance analysis
   # in order to generate initial data
   workflow_dispatch:
@@ -50,6 +52,9 @@ jobs:
         with:
           python-version: "3.12"
 
+      - name: Set up Rust toolchain
+        uses: ./.github/actions/setup-rust-toolchain
+
       - name: Set up uv
         uses: ./.github/actions/setup-uv-with-retries
         with:

.github/workflows/mutation-test.yml

@@ -38,6 +38,9 @@ jobs:
         with:
           python-version: "3.12"
 
+      - name: Set up Rust toolchain
+        uses: ./.github/actions/setup-rust-toolchain
+
       - name: Set up uv
         uses: ./.github/actions/setup-uv-with-retries
         with:

.github/workflows/test-code-quality.yml

@@ -37,6 +37,9 @@ jobs:
         with:
           python-version: "3.12"
 
+      - name: Set up Rust toolchain
+        uses: ./.github/actions/setup-rust-toolchain
+
       - name: Set up uv
         uses: ./.github/actions/setup-uv-with-retries
         with:

.github/workflows/test-linting.yml

@@ -32,6 +32,9 @@ jobs:
         with:
           python-version: "3.12"
 
+      - name: Set up Rust toolchain
+        uses: ./.github/actions/setup-rust-toolchain
+
       - name: Set up uv
         uses: ./.github/actions/setup-uv-with-retries
         with:
@@ -172,6 +175,9 @@ jobs:
         with:
           python-version: "3.12"
 
+      - name: Set up Rust toolchain
+        uses: ./.github/actions/setup-rust-toolchain
+
       - name: Set up uv
         uses: ./.github/actions/setup-uv-with-retries
         with:

.github/workflows/test-mcp.yml

@@ -31,6 +31,9 @@ jobs:
         with:
           python-version: "3.12"
 
+      - name: Set up Rust toolchain
+        uses: ./.github/actions/setup-rust-toolchain
+
       - name: Set up uv
         uses: ./.github/actions/setup-uv-with-retries
         with:

.github/workflows/test-model-map.yaml

@@ -23,6 +23,9 @@ jobs:
         run: |
           jq empty model_prices_and_context_window.json
 
+      - name: Set up Rust toolchain
+        uses: ./.github/actions/setup-rust-toolchain
+
       - name: Set up uv
         uses: ./.github/actions/setup-uv-with-retries
         with:

.github/workflows/test-terraform-provider.yml

@@ -73,6 +73,9 @@ jobs:
         with:
           python-version: "3.12"
 
+      - name: Set up Rust toolchain
+        uses: ./.github/actions/setup-rust-toolchain
+
       - name: Set up uv
         uses: ./.github/actions/setup-uv-with-retries
         with:

.github/workflows/test-unit-documentation.yml

@@ -41,6 +41,9 @@ jobs:
         with:
           python-version: "3.12"
 
+      - name: Set up Rust toolchain
+        uses: ./.github/actions/setup-rust-toolchain
+
       - name: Set up uv
         uses: ./.github/actions/setup-uv-with-retries
         with:

.github/workflows/test-unit-proxy-legacy.yml

@@ -58,6 +58,9 @@ jobs:
         with:
           python-version: "3.12"
 
+      - name: Set up Rust toolchain
+        uses: ./.github/actions/setup-rust-toolchain
+
       - name: Set up uv
         uses: ./.github/actions/setup-uv-with-retries
         with:

.github/workflows/weekly_load_anomaly.yml

@@ -42,6 +42,9 @@ jobs:
         with:
           python-version: "3.12"
 
+      - name: Set up Rust toolchain
+        uses: ./.github/actions/setup-rust-toolchain
+
       - name: Set up uv
         uses: ./.github/actions/setup-uv-with-retries
         with: