Update references from master branch to main branch (#750)

.github/workflows/checks.yml

@@ -3,7 +3,7 @@ name: checks
 on:
   push:
     branches:
-      - master
+      - main
     paths-ignore:
       - '**.md'
   pull_request:

.github/workflows/deploy.yml

@@ -3,7 +3,7 @@ name: demo deploy
 on:
   push:
     branches:
-      - master
+      - main
 
 env:
   FLY_API_TOKEN: ${{ secrets.FLY_TOKEN }}

.github/workflows/docker.yml

@@ -3,7 +3,7 @@ name: docker
 on:
   push:
     branches:
-      - master
+      - main
 
 env:
   GO_VERSION: "1.22"

README.md

@@ -3,7 +3,7 @@
 Simple web-based and cross platform PostgreSQL database explorer.
 
 [![Release](https://img.shields.io/github/release/sosedoff/pgweb.svg?label=Release)](https://github.com/sosedoff/pgweb/releases)
-[![Linux Build](https://github.com/sosedoff/pgweb/actions/workflows/checks.yml/badge.svg)](https://github.com/sosedoff/pgweb/actions?query=branch%3Amaster)
+[![Linux Build](https://github.com/sosedoff/pgweb/actions/workflows/checks.yml/badge.svg)](https://github.com/sosedoff/pgweb/actions?query=branch%3Amain)
 [![Go Report Card](https://goreportcard.com/badge/github.com/sosedoff/pgweb)](https://goreportcard.com/report/github.com/sosedoff/pgweb)
 [![GoDoc](https://godoc.org/github.com/sosedoff/pgweb?status.svg)](https://godoc.org/github.com/sosedoff/pgweb)
 [![Docker Pulls](https://img.shields.io/docker/pulls/sosedoff/pgweb.svg)](https://hub.docker.com/r/sosedoff/pgweb/)