Only export LIBCLANG_PATH and PATH if export is set

Closes: #35

Author: chrysn

README.md

@@ -54,6 +54,7 @@ This action can be configured in various ways using its inputs:
 |   `version`    |     Which version of the toolchain to install     | string | _latest_ |
 |   `ldproxy`    | Whether to install `ldproxy` (required for `std`) |  bool  |  `true`  |
 |   `override`   |         Overrides the installed toolchain         |  bool  |  `true`  |
+|    `export`    |           Sources `${ESPUP_EXPORT_FILE}`          |  bool  |  `true`  |
 
 All inputs are optional; if no inputs are provided:
 

action.yaml

@@ -22,6 +22,9 @@ inputs:
   override:
     description: Whether to override the toolchain
     default: true
+  export:
+    description: Whether to export the `${ESPUP_EXPORT_FILE}` into the GitHub environment
+    default: true
 
 runs:
   using: composite
@@ -65,8 +68,10 @@ runs:
         [[ "${{ inputs.version }}" != latest ]] && version="--toolchain-version ${{ inputs.version }}" || version=""
         "$HOME/.cargo/bin/espup" install -l debug --targets ${{ inputs.buildtargets }} $version
         source "$HOME/exports"
-        echo "$PATH" >> "$GITHUB_PATH"
-        echo "LIBCLANG_PATH=${LIBCLANG_PATH}" >> "$GITHUB_ENV"
+        if [[ "${{ inputs.export }}" = true ]]; then
+            echo "$PATH" >> "$GITHUB_PATH"
+            echo "LIBCLANG_PATH=${LIBCLANG_PATH}" >> "$GITHUB_ENV"
+        fi
 
     - name: Install Xtensa toolchain (Windows)
       if: env.HOST_TARGET == 'x86_64-pc-windows-msvc'