feat: adding buildargs support (#12)

* feat: adding buildargs support

* chore: changing typo to build-args and adding support for multiple build-args

* chore: updating comment

* chore: modify to accept list of argmuments rather than comma separated list

* chore: adjusting parsing of buildargs

* chore: fixed dockumentation, and changed entrypoing.sh to a bash script

---------

Co-authored-by: Geir Arnesen <geir.arnesen@schibsted.no>

Author: geirearnesen

README.md

@@ -15,6 +15,13 @@ The Deploy action performs the functions of combining the [Build](https://github
 **Optional** Whether to utilise the docker cache during the build. Defaults to true.
 ### `manifest`
 **Optional** Use a custom path for your convox.yml
+### `buildargs`
+**Optional** Pass docker build arguments to the build process. Build args are key-value pairs separated by a newline:
+```
+  buildargs: |
+    BASEIMAGE=myimage
+    MYARG=hello
+```
 
 
 ## Example Usage

action.yml

@@ -28,6 +28,9 @@ inputs:
   manifest:
     description: Use a custom path for your convox.yml
     required: false
+  buildargs:
+    description: Custom build arguments for the Docker build
+    required: false
 runs:
   using: docker
   image: Dockerfile

entrypoint.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 echo "Deploying"
 if [ -n "$INPUT_PASSWORD" ]
 then
@@ -22,4 +22,18 @@ if [ "$INPUT_MANIFEST" != "" ]; then
     MANIFEST_COMMAND="-m $INPUT_MANIFEST"
 fi
 
-convox deploy --app $INPUT_APP --description "$INPUT_DESCRIPTION" $CACHED_COMMAND $MANIFEST_COMMAND
+# Split the INPUT_BUILDARGS by newline into an array
+if [ "$INPUT_BUILDARGS" != "" ]; then
+    IFS=$'\n' read -d '' -r -a ADDR <<< "$INPUT_BUILDARGS"  # Split build arguments by newline
+
+    for ARG in "${ADDR[@]}"; do
+        # Extract key and value (handle empty lines or invalid format)
+        KEY=${ARG%%=*}
+        VALUE=${ARG#*=}
+        if [[ -n "$KEY" && -n "$VALUE" ]]; then
+            BUILDARGS_COMMAND="$BUILDARGS_COMMAND --build-args $KEY=$VALUE"
+        fi
+    done
+fi
+
+convox deploy --app $INPUT_APP --description "$INPUT_DESCRIPTION" $BUILDARGS_COMMAND $CACHED_COMMAND $MANIFEST_COMMAND