feat: add support for custom shells

README.md

@@ -20,6 +20,12 @@ GitHub Actions for running [CodSpeed](https://codspeed.io) in your CI.
     # If you're instrumenting a public repository, you can omit this value
     token: ""
 
+    # [OPTIONAL]
+    # The shell to run commands in.
+    # Defaults to bash.
+    # ⚠️ WARNING: if you use `defaults.run.shell`, you must still set this parameter.
+    shell: ""
+
     # [REQUIRED]
     # The command used to run your codspeed benchmarks
     run: ""

action.yml

@@ -9,6 +9,12 @@ inputs:
   token:
     description: "CodSpeed upload token"
     required: false
+  shell:
+    description:  |
+      The shell to run commands in.
+      Warning: if you use defaults.run.shell, you must still set this parameter.
+    required: false
+    default: bash
   run:
     description: "The command to run the benchmarks"
     required: true
@@ -40,7 +46,7 @@ inputs:
 runs:
   using: "composite"
   steps:
-    - shell: bash
+    - shell: ${{ inputs.shell }}
       run: |
         # Configure and run codspeed-runner