security upgrade for alpine to 3.18 (#2792)

cmd/builder/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.17
+FROM alpine:3.18
 RUN apk add --update ca-certificates
 COPY builder /builder
 ENTRYPOINT ["/builder"]

cmd/fetcher/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.17
+FROM alpine:3.18
 RUN apk add --update ca-certificates
 COPY fetcher /
 ENTRYPOINT ["/fetcher"]

cmd/fission-bundle/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.17
+FROM alpine:3.18
 RUN apk add --update ca-certificates
 COPY fission-bundle /
 ENTRYPOINT ["/fission-bundle"]

cmd/preupgradechecks/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.17
+FROM alpine:3.18
 RUN apk add --update ca-certificates
 COPY pre-upgrade-checks /
 ENTRYPOINT ["/pre-upgrade-checks"]

cmd/reporter/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.17
+FROM alpine:3.18
 RUN apk add --update ca-certificates
 COPY reporter /
 ENTRYPOINT ["/reporter"]