Replace named arg

.github/workflows/ci.yml

@@ -48,8 +48,8 @@ jobs:
           INPUT_WHO_TO_GREET: Mona Lisa Octocat
         run: |
           docker run \
-            --env INPUT_WHO_TO_GREET="Mona Lisa Octocat" \
-            --rm ${{ env.TEST_TAG }}
+            --rm ${{ env.TEST_TAG }} \
+            ${{ env.INPUT_WHO_TO_GREET }}
 
   test-action:
     name: GitHub Actions Test

README.md

@@ -51,21 +51,10 @@ need to perform some initial setup steps before you can develop your action.
 
 1. :white_check_mark: Test the container
 
-   You can pass individual environment variables using the `--env` or `-e` flag.
+   You can pass input arguments in the `docker run` call.
 
    ```bash
-   $ docker run --env INPUT_WHO_TO_GREET="Mona Lisa Octocat" actions/container-action
-
-   ::notice file=entrypoint.sh,line=7::Hello, Mona Lisa Octocat!
-   ```
-
-   Or you can pass a file with environment variables using `--env-file`.
-
-   ```bash
-   $ cat ./.env.test
-   INPUT_WHO_TO_GREET="Mona Lisa Octocat"
-
-   $ docker run --env-file ./.env.test actions/container-action
+   $ docker run actions/container-action "Mona Lisa Octocat"
 
    ::notice file=entrypoint.sh,line=7::Hello, Mona Lisa Octocat!
    ```
@@ -87,13 +76,12 @@ can choose any base Docker image and language you like, you can change this to
 suite your needs. There are a few main things to remember when writing code for
 container actions:
 
-- Inputs are accessed using environment variables with the format
-  `INPUT_<INPUT_NAME>`. For example, this action has an input called
-  `who-to-greet`, which can be accessed in the entrypoint script using
-  `INPUT_WHO_TO_GREET`.
+- Inputs are accessed using argument identifiers. For example, the first input
+  to this action, `who-to-greet`, can be accessed in the entrypoint script using
+  `$1`.
 
   ```bash
-  GREETING="Hello, $INPUT_WHO_TO_GREET!"
+  GREETING="Hello, $1!"
   ```
 
 - GitHub Actions supports a number of different workflow commands such as
@@ -140,7 +128,7 @@ So, what are you waiting for? Go ahead and start customizing your action!
 
    ```bash
    docker build -t actions/container-action .
-   docker run --env INPUT_WHO_TO_GREET="Mona Lisa Octocat" actions/container-action
+   docker run actions/container-action "Mona Lisa Octocat"
    ```
 
 1. Commit your changes

entrypoint.sh

@@ -1,7 +1,7 @@
 #!/bin/sh -l
 
 # Use INPUT_<INPUT_NAME> to get the value of an input
-GREETING="Hello, $INPUT_WHO_TO_GREET!"
+GREETING="Hello, $1!"
 
 # Use workflow commands to do things like set debug messages
 echo "::notice file=entrypoint.sh,line=7::$GREETING"