remove hard-coded pathname so test data populates

- Removes the hard-coded `fake-gcs-action` part of the `INPUT_DATA` path,
  and moves the path expansion up before the "exists" check.
- Updates documentation and this repo's own github action to reflect path
  requirements.

README.md

@@ -16,7 +16,7 @@ steps:
     with:
       version: "1.19.4"
       backend: memory
-      data: ./testdata
+      data: my-project-name/testdata
       public-host: "storage.gcs.127.0.0.1.nip.io:4443"
       external-url: "https://storage.gcs.127.0.0.1.nip.io:4443"
 ```

action.yml

@@ -10,23 +10,23 @@ inputs:
   # check the docs for fake-gcs-server at
   # https://github.com/fsouza/fake-gcs-server.
   backend:
-    description: "Storage backend for fake-gcs-server"
+    description: "Storage backend for fake-gcs-server."
     required: false
     default: "memory"
   data:
-    description: "Optional directory indicating where to load data from. Must be relative to the workspace"
+    description: "Optional directory indicating where to load data from. Must be relative to the workspace, so make sure actions/checkout runs first."
     required: false
     default: ""
   external-url:
-    description: "Optional external URL, returned in the Location header for uploads. Defaults to the address where the server is running"
+    description: "Optional external URL, returned in the Location header for uploads. Defaults to the address where the server is running."
     required: false
     default: ""
   public-host:
-    description: "Optional hostname to use as the public host for download endpoints"
+    description: "Optional hostname to use as the public host for download endpoints."
     required: false
     default: ""
   debug:
-    description: "Set it to true to see server logs after start and more debugging information"
+    description: "Set it to true to see server logs after start and more debugging information."
     required: false
     default: ""
 runs:

entrypoint.sh

@@ -15,15 +15,21 @@ INPUT_PUBLIC_HOST=$(printenv INPUT_PUBLIC-HOST)
 docker_image=fsouza/fake-gcs-server:${INPUT_VERSION}
 
 if [ -n "${INPUT_DATA}" ]; then
+	if [ -n "${INPUT_DEBUG}" ]; then
+		echo "INPUT_DATA=${INPUT_DATA}"
+		echo "RUNNER_WORKSPACE=${RUNNER_WORKSPACE}"
+		# find "$RUNNER_WORKSPACE"
+		echo "PWD=$(pwd)"
+		# find .
+	fi
+
+
+	INPUT_DATA=$(pwd)/${INPUT_DATA}
 	if ! [ -d "${INPUT_DATA}" ]; then
 		echo "ERROR: input data should be a directory. Make sure it exists and is specified as a relative path" >&2
 		exit 2
 	fi
 
-	if [ -n "${INPUT_DEBUG}" ]; then
-		echo "RUNNER_WORKSPACE=${RUNNER_WORKSPACE}"
-	fi
-	INPUT_DATA=${RUNNER_WORKSPACE}/fake-gcs-action/${INPUT_DATA}
 	args+=(-data "${INPUT_DATA}" )
 	docker_args+=(--volume "${INPUT_DATA}:${INPUT_DATA}")
 fi