Make vite tool shed client proxy configurable

lib/tool_shed/webapp/frontend/README.md

@@ -0,0 +1,23 @@
+# Tool Shed 2.0 client
+
+You will need to start the Tool Shed backend from the galaxy root directory.
+This is required if you want to develop against a local tool shed, and if you
+plan to make changes to the graphql queries if you want to target a remote tool shed.
+
+```shell
+TOOL_SHED_API_VERSION=v2 ./run_tool_shed.sh
+```
+
+Start the HMR dev server **and** the graphql dev server
+
+```shell
+yarn run dev-all
+```
+
+If you want to target an external V2 tool shed API run
+
+```shell
+TOOL_SHED_URL=https://testtoolshed.g2.bx.psu.edu CHANGE_ORIGIN=true yarn vite dev
+```
+
+Note that you still need a local backend to generate the graphql schema.

lib/tool_shed/webapp/frontend/vite.config.ts

@@ -23,11 +23,9 @@ export default defineConfig({
     server: {
         proxy: {
             "/api": {
-                // This is the URL of the backend server
-                // The address is the default when running `make run_test_backend`
-                target: "http://127.0.0.1:9009/",
-                changeOrigin: true,
-                secure: false,
+                target: process.env.TOOL_SHED_URL || "http://127.0.0.1:9009",
+                changeOrigin: process.env.CHANGE_ORIGIN ? !process.env.CHANGE_ORIGIN : true,
+                secure: !process.env.CHANGE_ORIGIN,
             },
         },
     },