embed templates into binary

Signed-off-by: Markus Blaschke <mblaschke82@gmail.com>

Author: mblaschke

Dockerfile

@@ -25,7 +25,6 @@ FROM gcr.io/distroless/static as test
 USER 0:0
 WORKDIR /app
 COPY --from=build /go/src/github.com/webdevops/azure-resourcegraph-exporter/azure-resourcegraph-exporter .
-COPY --from=build /go/src/github.com/webdevops/azure-resourcegraph-exporter/templates ./templates
 RUN ["./azure-resourcegraph-exporter", "--help"]
 
 #############################################

main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"embed"
 	"encoding/base64"
 	"errors"
 	"fmt"
@@ -39,6 +40,9 @@ var (
 
 	metricCache *cache.Cache
 
+	//go:embed templates/*.html
+	templates embed.FS
+
 	// Git version information
 	gitCommit = "<unknown>"
 	gitTag    = "<unknown>"
@@ -152,7 +156,7 @@ func startHttpServer() {
 	})
 
 	// report
-	reportTmpl := template.Must(template.ParseFiles("./templates/query.html"))
+	tmpl := template.Must(template.ParseFS(templates, "templates/*.html"))
 	mux.HandleFunc("/query", func(w http.ResponseWriter, r *http.Request) {
 		cspNonce := base64.StdEncoding.EncodeToString([]byte(uuid.New().String()))
 
@@ -174,7 +178,7 @@ func startHttpServer() {
 			Nonce: cspNonce,
 		}
 
-		if err := reportTmpl.Execute(w, templatePayload); err != nil {
+		if err := tmpl.ExecuteTemplate(w, "query.html", templatePayload); err != nil {
 			log.Error(err)
 		}
 	})