Separate out GQL proxy server from uniswap-urbit stack (#681)

* Separate out uniswap gql proxy in a stack

* Use proxy server from watcher-ts

* Add a flag to enable/disable the proxy server

* Update env configuratoin for uniswap urbit app stack

* Update stack file for uniswap urbit app stack

* Fix env variables in instructions

stack_orchestrator/data/stacks/proxy-server/README.md

@@ -0,0 +1,79 @@
+# Proxy Server
+
+Instructions to setup and deploy a HTTP proxy server
+
+## Setup
+
+Clone required repository:
+
+```bash
+laconic-so --stack proxy-server setup-repositories --pull
+
+# If this throws an error as a result of being already checked out to a branch/tag in a repo, remove the repositories mentioned below and re-run the command
+```
+
+Build the container image:
+
+```bash
+laconic-so --stack proxy-server build-containers
+```
+
+## Create a deployment
+
+* First, create a spec file for the deployment, which will allow mapping the stack's ports and volumes to the host:
+
+  ```bash
+  laconic-so --stack proxy-server deploy init --output proxy-server-spec.yml
+  ```
+
+* Edit `network` in spec file to map container ports to same ports in host:
+
+  ```yml
+  ...
+  network:
+    ports:
+      proxy-server:
+        - '4000:4000'
+  ...
+  ```
+
+* Once you've made any needed changes to the spec file, create a deployment from it:
+
+  ```bash
+  laconic-so --stack proxy-server deploy create --spec-file proxy-server-spec.yml --deployment-dir proxy-server-deployment
+  ```
+
+* Inside the deployment directory, open the file `config.env` and set the following env variables:
+
+  ```bash
+  # Whether to run the proxy server (Optional) (Default: true)
+  ENABLE_PROXY=
+
+  # Upstream endpoint
+  # (Eg. https://api.example.org)
+  CERC_PROXY_UPSTREAM=
+
+  # Origin header to be used (Optional)
+  # (Eg. https://app.example.org)
+  CERC_PROXY_ORIGIN_HEADER=
+  ```
+
+## Start the stack
+
+Start the deployment:
+
+```bash
+laconic-so deployment --dir proxy-server-deployment start
+```
+
+* List and check the health status of the container using `docker ps`
+
+* The proxy server will now be listening at http://localhost:4000
+
+## Clean up
+
+To stop the service running in background:
+
+```bash
+laconic-so deployment --dir proxy-server-deployment stop
+```

stack_orchestrator/data/stacks/proxy-server/stack.yml

@@ -0,0 +1,8 @@
+version: "0.1"
+name: proxy-server
+repos:
+  - github.com/cerc-io/watcher-ts@v0.2.78
+containers:
+  - cerc/watcher-ts
+pods:
+  - proxy-server