update repository references and improve script handling

proxy/Dockerfile

@@ -0,0 +1,23 @@
+ARG BUILD_ARCH
+# hadolint ignore=DL3006
+FROM ghcr.io/hassio-addons/debian-base/${BUILD_ARCH}:5.1.1
+
+# Set shell
+SHELL ["/bin/bash", "-o", "pipefail", "-c"]
+
+# Setup base
+# hadolint ignore=DL3003
+RUN apt-get -qq update \
+  && apt-get -qq install --no-install-recommends -y nginx \
+  && (apt-get autoremove -y; apt-get autoclean -y)
+
+# Copy root filesystem
+COPY rootfs /
+
+ARG BUILD_ARCH
+ARG BUILD_DATE
+ARG BUILD_DESCRIPTION
+ARG BUILD_NAME
+ARG BUILD_REF
+ARG BUILD_REPOSITORY
+ARG BUILD_VERSION