Fix utils/run action deployment targeting (#216)

Summary:
Instead of specifying the deployment via the URL, use the --deployment argument.

Test Plan:
Use this action when pointed at a branch deployment, it now launches a run in that branch deployment.

Author: gibsondan

src/run.sh

@@ -11,7 +11,8 @@ fi
 
 RUN_ID=$(
     dagster-cloud job launch \
-    --url "${DAGSTER_CLOUD_URL}/${INPUT_DEPLOYMENT}" \
+    --url "${DAGSTER_CLOUD_URL}" \
+    --deployment "${INPUT_DEPLOYMENT}" \
     --api-token "$DAGSTER_CLOUD_API_TOKEN" \
     --location "${INPUT_LOCATION_NAME}" \
     --repository "${INPUT_REPOSITORY_NAME}" \

tests/test_run.py

@@ -1,5 +1,3 @@
-import json
-
 def test_run(tmp_path, exec_context, action_docker_image_id):
     output_file = tmp_path / "output.txt"
     output_file.touch()
@@ -22,8 +20,9 @@ def test_run(tmp_path, exec_context, action_docker_image_id):
     exec_context.stub_command(
         "dagster-cloud",
         {
-            "job launch --url http://dagster.cloud/test/prod "
-            "--api-token api-token  "
+            "job launch --url http://dagster.cloud/test "
+            "--deployment prod "
+            "--api-token api-token "
             "--location some-location "
             "--repository some-repository "
             "--job some-job "