Update dependency alpine to v3.15

Author: renovate-bot

Dockerfile

@@ -11,7 +11,7 @@ WORKDIR /src
 RUN make setup
 RUN make build
 
-FROM alpine:3.13
+FROM alpine:3.15
 RUN mkdir /lib64
 RUN ln -s /lib/libc.musl-x86_64.so.1 /lib64/ld-linux-x86-64.so.2
 COPY --from=builder /src/cli-template /usr/local/bin