Specify shell used for action steps

Author: akrantz01

action.yml

@@ -1,6 +1,10 @@
 ---
 name: Setup Rust
 description: Setup Rust toolchain and Shipyard registry access
+branding:
+  icon: package
+  color: purple
+
 inputs:
   ssh-private-key:
     description: PEM-encoded SSH private key for pulling the Shipyard registry index
@@ -19,6 +23,7 @@ inputs:
   components:
     description: Comma-separated list of components to be additionally installed
     required: false
+
 runs:
   using: composite
   steps:
@@ -32,15 +37,18 @@ runs:
         ssh-private-key: ${{ inputs.ssh-private-key }}
 
     - name: Add Shipyard host key to .ssh/known_hosts
+      shell: bash
       run: |
         mkdir -p ~/.ssh
         touch ~/.ssh/known_hosts
         ssh-keyscan ssh.shipyard.rs >> ~/.ssh/known_hosts
 
     - name: Login to Shipyard registry
+      shell: bash
       run: cargo login --registry ${{ inputs.registry }} ${{ inputs.token }}
 
     - name: Set Cargo environment variables
+      shell: bash
       run: |
         echo "CARGO_NET_GIT_FETCH_WITH_CLI=true" >> $GITHUB_ENV
         echo "CARGO_HTTP_USER_AGENT=shipyard ${{ inputs.token }}" >> $GITHUB_ENV