chore: add shell property

Author: SkySails

action.yml

@@ -18,4 +18,5 @@ runs:
       run: echo "${{ inputs.token }}" | docker login ghcr.io -u navigraph-bot --password-stdin
 
     - name: Run cargo-msfs
+      shell: bash
       run: docker run ghcr.io/navigraph/cargo-msfs-bin:latest -v $PWD:/repo-content -w /repo-content ${{ inputs.args }}