fix: restore apk upgrade to patch OS package CVEs in base image (#73)

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

Author: abnegate

Dockerfile

@@ -20,6 +20,7 @@ ENV \
 
 RUN \
   apk update && \
+  apk upgrade --no-cache && \
   apk add --no-cache \
     autoconf \
     automake \
@@ -214,6 +215,7 @@ LABEL base_image=$BASE_IMAGE
 LABEL maintainer="team@appwrite.io"
 
 RUN apk update && \
+  apk upgrade --no-cache && \
   apk add --no-cache \
     brotli \
     c-ares \