Update alpine Docker tag to v3.15

renovate-bot · renovate-bot · commit 1f6e217e5cfc · 2021-11-19T01:45:56.000Z
diff --git a/Dockerfile b/Dockerfile
@@ -16,7 +16,7 @@ COPY . .
 
 RUN CGO_ENABLED=0 go build -o webhook -ldflags '-w -extldflags "-static"' .
 
-FROM alpine:3.12
+FROM alpine:3.15
 
 RUN apk add --no-cache ca-certificates
 
