Basic golang CI setup (#360)

* bskyweb: Makefile and dev env

This matches the setup for local dev testing in atproto and indigo
repos.

* gitignore: don't ignore self and .github/

* CI: golang build+test and lint actions

* bskyweb: better use of godotenv

A recent change from indigo.

* prettier: ignore top-level app.json

* CI: bump from golang 1.19 to 1.20

* bskyweb: update to golang 1.20

bskyweb/cmd/bskyweb/main.go

@@ -3,8 +3,9 @@ package main
 import (
 	"os"
 
+	_ "github.com/joho/godotenv/autoload"
+
 	logging "github.com/ipfs/go-log"
-	"github.com/joho/godotenv"
 	"github.com/urfave/cli/v2"
 )
 
@@ -16,15 +17,6 @@ func init() {
 }
 
 func main() {
-
-	// only try dotenv if it exists
-	if _, err := os.Stat(".env"); err == nil {
-		err := godotenv.Load()
-		if err != nil {
-			log.Fatal("Error loading .env file")
-		}
-	}
-
 	run(os.Args)
 }