Embed static resources (#1466)

* Replace pkger with go:embed for bundling the admin. Closes #844

* Remove references to pkged.go

* Point tests to use an updated version of Go

* Add comment to new exported function

* Cleanup

* Add a dummy pkged.go to alert people to stop using it.

* Add simple browser test to make sure the admin is available and renders

* Don't panic

* Embed bot/scraper metadata template.

Add browser test to validate the rendering of this template.

* Use embedded offline.ts segment

* Remove placeholder thumbnail as its unnecessary

* Remove copying the static directory into the release

* Cleanup

core/streamState.go

@@ -4,6 +4,7 @@ import (
 	"bufio"
 	"fmt"
 	"io"
+	"io/ioutil"
 	"os"
 	"path/filepath"
 	"time"
@@ -17,6 +18,7 @@ import (
 	"github.com/owncast/owncast/core/transcoder"
 	"github.com/owncast/owncast/core/webhooks"
 	"github.com/owncast/owncast/models"
+	"github.com/owncast/owncast/static"
 	"github.com/owncast/owncast/utils"
 
 	"github.com/grafov/m3u8"
@@ -84,8 +86,18 @@ func SetStreamAsDisconnected() {
 	_stats.LastConnectTime = nil
 	_broadcaster = nil
 
+	offlineFileData := static.GetOfflineSegment()
 	offlineFilename := "offline.ts"
-	offlineFilePath := "static/" + offlineFilename
+	offlineTmpFile, err := ioutil.TempFile(os.TempDir(), offlineFilename)
+	if err != nil {
+		log.Errorln("unable to create temp file for offline video segment")
+	}
+
+	if _, err = offlineTmpFile.Write(offlineFileData); err != nil {
+		log.Errorln("unable to write offline segment to disk", err)
+	}
+
+	offlineFilePath := offlineTmpFile.Name()
 
 	transcoder.StopThumbnailGenerator()
 	rtmp.Disconnect()