Use latest alpine version for docker files

Dockerfile-build

@@ -9,7 +9,7 @@ RUN \
  ansible-playbook -i inventory site.yml
 
 # runtime stage
-FROM alpine:3.13
+FROM alpine:latest
 
 COPY --from=builder /var/www/html/ /mnt/
 COPY docker-build-root/ /

Dockerfile-build.production

@@ -9,7 +9,7 @@ RUN \
  ansible-playbook -i inventory site.yml --extra-vars "@script/netbootxyz-overrides.yml"
 
 # runtime stage
-FROM alpine:3.13
+FROM alpine:latest
 
 COPY --from=builder /var/www/html/ /mnt/
 COPY docker-build-root/ /