Add shell input support.

Dockerfile

@@ -1,7 +1,5 @@
 ARG IMAGE=alpine:3.20
+ARG SHELL=sh
 FROM ${IMAGE}
-COPY entrypoint.sh /entrypoint.sh
-RUN ls -al
-RUN pwd
-RUN ls -al /entrypoint.sh
+COPY entrypoint-${SHELL}.sh /entrypoint.sh
 ENTRYPOINT ["/entrypoint.sh"]

README.md

@@ -38,3 +38,4 @@ Configuration
 |-------|------|-------------|----------|---------|---------|
 | command | string | Shell command to be executed via a Docker container | Yes | - |  `cat /etc/*-release` |
 | image | string | Docker image to be used for running the container | No | `alpine:3.20` | `ubuntu:22.04` |
+| shell | string | Shell to be used for running the command | No | `sh` | `bash` |

action.yml

@@ -18,14 +18,20 @@ inputs:
     type: string
     required: false
     default: 'alpine:3.20'
+  shell:
+    description: |
+      Shell to be used for running the command
+    type: string
+    required: false
+    default: 'sh'
 runs:
   using: 'composite'
   steps:
     - name: Build Docker image
-      shell: bash
+      shell: sh
       run: |
-        docker build -f Dockerfile --build-arg IMAGE=${{ inputs.image }} -t local_image:8.8.8 .
+        docker build -f Dockerfile --build-arg IMAGE=${{ inputs.image }} --build-arg SHELL=${{ inputs.shell }} -t local_image:8.8.8 .
     - name: Run Docker container
-      shell: bash
+      shell: sh
       run: |
         docker run --rm -v /var/run/docker.sock:/var/run/docker.sock --name local_container local_image:8.8.8 "${{ inputs.command }}"

entrypoint-sh.sh

@@ -0,0 +1,8 @@
+#!/bin/sh
+set -o errexit
+set -o nounset
+
+COMMAND="${1}"
+
+echo "Executing command: ${COMMAND}"
+sh -c "${COMMAND}"