Docker: apt cache cleanup in runtime stage and typo fixes

- Add rm -rf /var/lib/apt/lists/* to runtime stage in Dockerfile and
  Dockerfile.buildx to reduce final image size (~30-40 MB savings)
- Add apt-get clean to Dockerfile.buildx runtime stage
- Fix typos: "Seup" -> "Setup", "Tagert" -> "Target"

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docker/Dockerfile

@@ -14,7 +14,7 @@ FROM debian:bookworm AS aqualinkd-build
 RUN apt-get update && \
     apt-get -y install curl make gcc libsystemd-dev
 
-# Seup working dir
+# Setup working dir
 RUN mkdir /home/AqualinkD
 WORKDIR /home/AqualinkD
 
@@ -39,7 +39,8 @@ ARG AQUALINKD_VERSION
 
 RUN apt-get update && \
     apt-get install -y cron curl socat && \
-    apt-get clean
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/*
 
 # Set cron to read local.d
 RUN sed -i '/EXTRA_OPTS=.-l./s/^#//g' /etc/default/cron

docker/Dockerfile.buildx

@@ -34,7 +34,7 @@ ARG TARGETARCH
 
 # Print all buildx variables 
 RUN echo "Build Arch $BUILDARCH" && \
-    echo "Tagert OS $TARGETOS"
+    echo "Target OS $TARGETOS"
 
 # Setup build env, using toolchain for all builds, even native, since make this Dockerfile cleaner
 # and no need to use bash if statments.
@@ -78,7 +78,9 @@ RUN make clean && \
 FROM debian:bookworm-slim AS aqualinkd
 
 RUN apt-get update \
-  && apt-get install -y cron curl socat
+  && apt-get install -y cron curl socat \
+  && apt-get clean \
+  && rm -rf /var/lib/apt/lists/*
  
 # Set cron to read local.d
 RUN sed -i '/EXTRA_OPTS=.-l./s/^#//g' /etc/default/cron