Bump alpine to 3.13

Signed-off-by: Gábor Lipták <gliptak@gmail.com>

Dockerfile

@@ -40,7 +40,7 @@ RUN GOOS=${TARGETOS} GOARCH=${TARGETARCH} CGO_ENABLED=0 \
     -a -installsuffix cgo -o faas-cli
 
 # CICD stage
-FROM --platform=${TARGETPLATFORM:-linux/amd64} alpine:3.12 as root
+FROM --platform=${TARGETPLATFORM:-linux/amd64} alpine:3.13 as root
 
 ARG REPO_URL
 
@@ -57,7 +57,7 @@ ENV PATH=$PATH:/usr/bin/
 ENTRYPOINT [ "faas-cli" ]
 
 # Release stage
-FROM --platform=${TARGETPLATFORM:-linux/amd64} alpine:3.12 as release
+FROM --platform=${TARGETPLATFORM:-linux/amd64} alpine:3.13 as release
 
 ARG REPO_URL
 

Dockerfile.redist

@@ -62,7 +62,7 @@ RUN CGO_ENABLED=0 GOOS=linux GOARCH=arm64 go build --ldflags "-s -w \
        -a -installsuffix cgo -o faas-cli-arm64
 
 # Release stage
-FROM alpine:3.12
+FROM alpine:3.13
 
 RUN apk --no-cache add ca-certificates git
 

sample/imagemagick/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.10
+FROM alpine:3.13
 
 # Alternatively use ADD https:// (which will not be cached by Docker builder)
 RUN apk --no-cache add curl ca-certificates imagemagick \