Download browser during docker build

Closes #1

Dockerfile

@@ -15,4 +15,5 @@ COPY migrations ./migrations
 COPY *.go ./
 RUN go build -o /vivaplusdl
 
-CMD ["/vivaplusdl"]
+RUN /vivaplusdl --install
+CMD ["/vivaplusdl", "--no-install"]

main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"encoding/base64"
+	"flag"
 	"github.com/playwright-community/playwright-go"
 	"log"
 	"os"
@@ -10,12 +11,23 @@ import (
 )
 
 func main() {
+	var err error
+	var noInstall = flag.Bool("no-install", false, "skip browser installation")
+	var onlyInstall = flag.Bool("install", false, "install the required browser and do nothing else")
+	flag.Parse()
+
 	options := &playwright.RunOptions{
 		Browsers: []string{"firefox"},
 	}
-	err := playwright.Install(options)
-	if err != nil {
-		log.Panicf("error installing playwright: %v", err)
+	if !*noInstall {
+		err = playwright.Install(options)
+		if err != nil {
+			log.Panicf("error installing playwright: %v", err)
+		}
+	}
+
+	if *onlyInstall {
+		return
 	}
 
 	db := openDatabase()