Enclosed the docker run command in an expandable Here-String to accomodate multiline commands for entry points that support it.

Updated the documentation accordingly.
Replaced 'echo' with 'Write-Output' when used in Powershell context.

Author: ocochelin

README.md

@@ -11,8 +11,24 @@ Composite action for running commands in windows docker containers.
 
 ## Usage
 
-Very simple hello world example:
+Simple 'Hello world' example using the default `cmd.exe` ENTRYPOINT with the `/C` option:
+```
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+      - name: Test_Run
+        uses: philips-software/run-windows-docker-container-action@<version>
+        with:
+          image: mcr.microsoft.com/windows/servercore:20H2
+          entrypoint_args: /C
+          run: >-
+            echo Hello world & 
+            call run-test-script.bat;
+```
 
+Simple 'Hello world' example overriding the default ENTRYPOINT:
 ```
     steps:
       - name: Checkout
@@ -25,7 +41,7 @@ Very simple hello world example:
           image: mcr.microsoft.com/windows/servercore:20H2
           entrypoint: powershell.exe
           run: >-
-            echo "Hello world";
+            Write-Output "Hello world";
             ./run-test-script.ps1;
 ```
 
@@ -44,25 +60,27 @@ and work path.
 | parameter | description | required | default |
 | - | - | - | - |
 | image | Docker image. | `true` |  |
-| run | Command to execute. | `true` |  |
+| run | Command to execute. Must be single line for cmd.exe entry point (use &, && or \|\| operators to aggregate multiple commands). Can be multiline for entry points that support it, like powershell.exe. | `true` |  |
 | workspace_path | Workspace path. Default is root workspace path. | `false` |  |
 | mapping_path | Mapping path, i.e. path to where the workspace path is mapped in the docker container. Defaults to workspace_path. | `false` |  |
 | work_path | Work path, i.e. path where the command in the docker container is executed. Defaults to workspace_path. | `false` |  |
 | memory | Memory limit. See docker documentation on --memory. | `false` | 4GB |
 | entrypoint | Overrides the default ENTRYPOINT in docker image. | `false` |  |
+| entrypoint_args | Optional arguments for the ENTRYPOINT (default or overriden). For instance, `/S /C` for cmd.exe or `-NoLogo -NonInteractive -NoProfile` for powershell.exe. | `false` |  |
 | env_names | Environment variable names passed to docker image as comma separated list, for example: NAME1, NAME2, NAME3 | `false` |  |
 | extra_args | Extra arguments for docker run command. | `false` |  |
 | pre-warm | Run a warming-up container (which might crash due to first time use failure) | `false` | true |
-| pre-warm-cmd | Pre warm command to run inside the container | `false` | echo "warming up!" |
+| pre-warm-cmd | Pre warm command to run inside the container | `false` | Write-Output "warming up!" |
 | registry_authentication | Authenticate against registry server | `false` | false |
 | registry_username | Docker registry username. | `false` |  |
 | registry_token | Docker registry token | `false` |  |
 | registry_repository | Docker registry repository | `false` |  |
 
 
+<!-- action-docs-outputs -->
+## Outputs
 
-<!-- action-docs-inputs -->
-
+N/A
 
 <!-- action-docs-runs -->
 ## Runs

action.yml

@@ -10,7 +10,7 @@ inputs:
     description: 'Docker image.'
     required: true
   run:
-    description: 'Command to execute.'
+    description: 'Command to execute. Must be single line for cmd.exe entry point (use &, && or \|\| operators to aggregate multiple commands). Can be multiline for entry points that support it, like powershell.exe.'
     required: true
   workspace_path:
     description: 'Workspace path. Default is root workspace path.'
@@ -30,7 +30,7 @@ inputs:
     required: false
     default: ''
   entrypoint_args:
-    description: "Extra args for the ENTRYPOINT (default or overriden)."
+    description: "Optional arguments for the ENTRYPOINT (default or overriden). For instance, `/S /C` for cmd.exe or `-NoLogo -NonInteractive -NoProfile` for powershell.exe."
     required: false
     default: ''
   env_names:
@@ -48,7 +48,7 @@ inputs:
   pre-warm-cmd:
     description: 'Pre warm command to run inside the container'
     required: false
-    default: 'echo "warming up!"'
+    default: 'Write-Output "warming up!"'
   registry_authentication:
     description : 'Authenticate against registry server'
     required : false
@@ -96,8 +96,12 @@ runs:
         -w ${{ steps.settings.outputs.work_path }}
         ${{ inputs.image }}
         ${{ inputs.entrypoint_args }}
+        @"
+
         ${{ inputs.pre-warm-cmd }}
 
+        "@
+
         exit 0
       shell: powershell -NoLogo -NonInteractive -NoProfile -Command ". '{0}'"
     - name: Run
@@ -116,7 +120,11 @@ runs:
         -w ${{ steps.settings.outputs.work_path }}
         ${{ inputs.image }}
         ${{ inputs.entrypoint_args }}
+        @"
+
         ${{ inputs.run }}
+
+        "@
       shell: powershell -NoLogo -NonInteractive -NoProfile -Command ". '{0}'"
     - name: docker_logout
       id: docker_logout