Added optional directory input to install-rust-toolchain action (#59)

Author: Marcin-Radecki

install-rust-toolchain/action.yml

@@ -19,7 +19,10 @@ inputs:
   components:
     description: Optional. List of cargo components to install.
     required: false
-
+  directory:
+    description: Optional. Relative directory to current in which to perform rustup install. Useful when having 
+                cargo workspace with different rust-toolchain.toml files in the same repo.
+    required: false
 runs:
   using: composite
   steps:
@@ -35,28 +38,35 @@ runs:
 
     - name: Read channel from rust-toolchain.toml
       id: toolchain-channel
+      env:
+        DIR: ${{ inputs.directory || './' }}
       uses: SebRollen/toml-action@v1.2.0
       with:
-        file: 'rust-toolchain.toml'
+        file: '${{ env.DIR }}rust-toolchain.toml'
         field: 'toolchain.channel'
 
     - name: Read components from rust-toolchain.toml
       id: toolchain-components
+      env:
+        DIR: ${{ inputs.directory || './' }}
       uses: SebRollen/toml-action@v1.2.0
       with:
-        file: 'rust-toolchain.toml'
+        file: '${{ env.DIR }}rust-toolchain.toml'
         field: 'toolchain.components'
 
     - name: Read targets from rust-toolchain.toml
       id: toolchain-targets
+      env:
+        DIR: ${{ inputs.directory || './' }}
       uses: SebRollen/toml-action@v1.2.0
       with:
-        file: 'rust-toolchain.toml'
+        file: '${{ env.DIR }}rust-toolchain.toml'
         field: 'toolchain.targets'
 
     - name: Install rust toolchain
       id: install-rust-toolchain
       shell: bash
+      working-directory: ${{ inputs.directory || './' }}
       env:
         CHANNEL: ${{ inputs.channel || steps.toolchain-channel.outputs.value }}
       run: |
@@ -70,6 +80,7 @@ runs:
     - name: Add components (optional)
       if: inputs.components != '' || steps.toolchain-components.outputs.value != ''
       shell: bash
+      working-directory: ${{ inputs.directory || './' }}
       env:
         COMPONENTS: ${{ inputs.components || steps.toolchain-components.outputs.value }}
       run: |
@@ -82,6 +93,7 @@ runs:
     - name: Add targets (optional)
       if: inputs.targets != '' || steps.toolchain-targets.outputs.value != ''
       shell: bash
+      working-directory: ${{ inputs.directory || './' }}
       env:
         TARGETS: ${{ inputs.targets || steps.toolchain-targets.outputs.value }}
       run: |