Update alpine base image (#4)

Author: relusc

Dockerfile

@@ -16,7 +16,7 @@ COPY . .
 
 RUN CGO_ENABLED=0 go build -o webhook -ldflags '-w -extldflags "-static"' .
 
-FROM alpine:3.12
+FROM alpine:3.22
 
 RUN apk add --no-cache ca-certificates