Document env_file option (#48)

Co-authored-by: frenck <frenck@users.noreply.github.com>

README.md

@@ -40,11 +40,12 @@ jobs:
 
 ## Arguments
 
-|   Input   |                             Description                              |   Usage    |
+|   Input    |                             Description                              |   Usage    |
-| :-------: | :------------------------------------------------------------------: | :--------: |
+| :--------: | :------------------------------------------------------------------: | :--------: |
-|  `path`   | Path to the folder containing the Home Assistant Core configuration. | _Optional_ |
+| `env_file` |              Possible path to environment file to use.               | _Optional_ |
-| `secrets` |      Alternative secrets file to use, e.g., "fakesecrets.yaml".      | _Optional_ |
+|   `path`   | Path to the folder containing the Home Assistant Core configuration. | _Optional_ |
-| `version` |    Version to use; dev/beta/stable or a specific version number.     | _Optional_ |
+| `secrets`  |      Alternative secrets file to use, e.g., "fakesecrets.yaml".      | _Optional_ |
+| `version`  |    Version to use; dev/beta/stable or a specific version number.     | _Optional_ |
 
 ### Specific configuration folder
 

action.yaml

@@ -18,6 +18,9 @@ inputs:
   version:
     description: Version to use; dev/beta/stable or a specific version number
     required: false
+  env_file:
+    description: Possible path to environment file to use
+    required: false
 
 runs:
   using: "composite"
@@ -102,10 +105,14 @@ runs:
           --entrypoint "" \
           "ghcr.io/home-assistant/home-assistant:${{ steps.version.outputs.version }}" \
             python -m homeassistant --version
-
+        env_file_arg=""
+        if [[ -f "${{ inputs.env_file }}" ]]; then
+          env_file_arg="--env-file ${{ inputs.env_file }}"
+        fi
         docker run --rm \
           --entrypoint "" \
           -v $(pwd):/github/workspace \
+          $env_file_arg \
           --workdir /github/workspace \
           "ghcr.io/home-assistant/home-assistant:${{ steps.version.outputs.version }}" \
             python -m homeassistant \