feat: show build commit on admin page

internal/buildinfo/buildinfo.go

@@ -0,0 +1,7 @@
+package buildinfo
+
+// Commit is the git commit SHA the binary was built from.
+//
+// Set at build time via:
+//   -ldflags "-X ResendIt/internal/buildinfo.Commit=<sha>"
+var Commit = "dev"

internal/web/handler.go

@@ -1,6 +1,7 @@
 package web
 
 import (
+	"ResendIt/internal/buildinfo"
 	"ResendIt/internal/file"
 	"os"
 	"strconv"
@@ -108,9 +109,10 @@ func (h *Handler) AdminPage(c *gin.Context) {
 	totalPages := (totalCount + limit - 1) / limit
 
 	c.HTML(200, "admin.html", gin.H{
-		"Files":      adminFiles,
-		"Page":       page,
-		"TotalPages": totalPages,
+		"Files":       adminFiles,
+		"Page":        page,
+		"TotalPages":  totalPages,
+		"BuildCommit": buildinfo.Commit,
 	})
 }