Only trigger GitHub actions if relevant files change (#72)

* Add `on.pull_request.paths` to gh actions

* Format server/README.md to see if frontend action runs

.github/workflows/auto-comment.yml

@@ -2,6 +2,7 @@ name: Auto Comment on PRs
 on:
   pull_request:
     types: [opened]
+    paths: server/**
 jobs:
   auto-comment:
     runs-on: ubuntu-latest

.github/workflows/backend-lint-test.yml

@@ -3,6 +3,7 @@ on:
   pull_request:
     branches:
       - main
+    paths: server/**
 jobs:
   lint-test:
     runs-on: ubuntu-latest

.github/workflows/frontend-lint.yml

@@ -3,6 +3,7 @@ name: Frontend - Linting
 on:
   pull_request:
     branches: [main]
+    paths: client/**
 jobs:
   Linux:
     runs-on: ubuntu-latest

server/README.md

@@ -1,11 +1,14 @@
 ## Setup
+
 1. Copy `.env.example` to `.env` and fill in the values
 2. Add Firebase Admin credentials to a file named `firebaseServiceAccountKey.json`, at the same level as the `.env` file.
 3. Start up Docker Desktop
 4. Spin up Postgres:
+
 ```bash
 docker-compose --env-file .env up
 ```
 
 ## Directly querying Postgres on a local build using `psql`
-psql -h localhost -p 5432 -U acmucsd_dev -d hackathon_portal
+
+psql -h localhost -p 5432 -U acmucsd_dev -d hackathon_portal