Remove --update to apk in Dockerfiles

Signed-off-by: JoshVanL <vleeuwenjoshua@gmail.com>

Author: JoshVanL

Dockerfile

@@ -2,7 +2,7 @@
 FROM alpine:3.10
 LABEL description="OIDC reverse proxy authenticator based on Kubernetes"
 
-RUN apk --no-cache --update add ca-certificates
+RUN apk --no-cache add ca-certificates
 
 COPY ./bin/kube-oidc-proxy-linux /usr/bin/kube-oidc-proxy
 

test/tools/audit-webhook/Dockerfile

@@ -3,7 +3,7 @@ FROM alpine:3.10
 
 LABEL description="A audit webhook sink to read audit events and write to file."
 
-RUN apk --no-cache --update add ca-certificates
+RUN apk --no-cache add ca-certificates
 
 COPY ./bin/audit-webhook /usr/bin/audit-webhook
 

test/tools/fake-apiserver/Dockerfile

@@ -3,7 +3,7 @@ FROM alpine:3.10
 
 LABEL description="A fake API server that will respond to requests with the same body and headers."
 
-RUN apk --no-cache --update add ca-certificates
+RUN apk --no-cache add ca-certificates
 
 COPY ./bin/fake-apiserver-linux /usr/bin/fake-apiserver
 

test/tools/issuer/Dockerfile

@@ -3,7 +3,7 @@ FROM alpine:3.10
 
 LABEL description="A basic OIDC issuer that prsents a well-known and certs endpoint."
 
-RUN apk --no-cache --update add ca-certificates
+RUN apk --no-cache add ca-certificates
 
 COPY ./bin/oidc-issuer-linux /usr/bin/oidc-issuer