Streamlined Dockerfile.

Dockerfile

@@ -4,18 +4,25 @@ ARG go_version="1.15.1"
 ARG go="/usr/local/go/bin/go"
 ARG pitemp_src="https://github.com/icemarkom/pitemp.git"
 
-RUN apt-get update && apt-get upgrade -y && apt-get install -y gpg git curl
-RUN curl https://dl.google.com/go/go${go_version}.linux-$(dpkg --print-architecture).tar.gz -o go.tgz && \
-    tar xvfz go.tgz -C /usr/local && \
-    rm go.tgz
-COPY .gitconfig /etc/gitconfig
+# Builder image
+RUN apt-get update && \
+    apt-get install -y git curl
+
+RUN curl https://dl.google.com/go/go${go_version}.linux-$(dpkg --print-architecture).tar.gz \
+    | tar xz -C /usr/local
+
 RUN git clone ${pitemp_src} pitemp
+
 WORKDIR pitemp
+
 RUN ${go} build && \
     mv pitemp /usr/local/bin/pitemp
 
+# Final image
 FROM debian:latest
-COPY --from=pitemp-builder /usr/local/bin/pitemp /usr/local/bin
-EXPOSE 9550
+
+COPY --from=pitemp-builder /usr/local/bin/pitemp /usr/local/bin/pitemp
+
 ENTRYPOINT ["/usr/local/bin/pitemp"]
+
 CMD ["--help"]