Fix transient errors

.github/workflows/ci.yaml

@@ -6,6 +6,9 @@ on:
       - main
   push:
 
+env:
+  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
 jobs:
   check-environment:
     name: Check environmnent

README.md

@@ -17,17 +17,20 @@ on: [push]
 
 name: CI
 
+env:
+  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
 jobs:
   check:
     name: Rust project
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
       - name: Install Rust for Xtensa
-        uses: esp-rs/xtensa-toolchain@v1.3
+        uses: esp-rs/xtensa-toolchain@v1.5
         with:
           default: true
-          version: "1.63.0"
+          version: "1.66.0"
           ldproxy: true
 
       # `cargo check` command here will use installed `esp` toolchain, as it
@@ -38,6 +41,12 @@ jobs:
         with:
           command: check
 ```
+> **Note**
+> `GITHUB_TOKEN` environment variable needs to be [defined in the action], otherwise, the workflow may fail some times,
+see [#15] for details.
+
+[defined in the action]: https://docs.github.com/en/actions/learn-github-actions/variables
+[#15]: https://github.com/esp-rs/xtensa-toolchain/issues/15
 
 ## Inputs
 

action.yaml

@@ -41,6 +41,10 @@ runs:
     - name: Install Xtensa toolchain
       shell: bash
       run: |
-        bash ${{ github.action_path }}/install.sh ${{ inputs.buildtargets }} ${{ inputs.version }}
+        [[ "${{ inputs.version }}" != latest ]] && version="--toolchain-version ${{ inputs.version }}" || version=""
+        $HOME/.cargo/bin/espup install -l debug --export-file $HOME/exports --targets ${{ inputs.buildtargets }} $version
+        source "$HOME/exports"
+        echo "$PATH" >>"$GITHUB_PATH"
+        echo "LIBCLANG_PATH=${LIBCLANG_PATH}" >>"$GITHUB_ENV"
         [[ "${{ inputs.default }}" = true ]] && rustup default esp || true
         [[ "${{ inputs.override }}" = true ]] && rustup override unset || true