Install envsubst alternative (Go version)

Author: sturman

Dockerfile

@@ -12,6 +12,7 @@ LABEL maintainer="thespad"
 # environment settings
 ARG UNIFI_BRANCH="stable"
 ENV DEBIAN_FRONTEND="noninteractive"
+ENV ENVSUBST_VERSION=v1.4.3
 
 RUN \
   echo "**** install packages ****" && \
@@ -22,6 +23,9 @@ RUN \
     openjdk-17-jre-headless \
     unzip \
     gettext && \
+  curl -L https://github.com/a8m/envsubst/releases/download/${ENVSUBST_VERSION}/envsubst-`uname -s`-`uname -m` -o envsubst && \
+  chmod +x envsubst && \
+  mv envsubst /usr/local/bin && \
   echo "**** install unifi ****" && \
   if [ -z ${UNIFI_VERSION+x} ]; then \
     UNIFI_VERSION=$(curl -sX GET https://dl.ui.com/unifi/debian/dists/${UNIFI_BRANCH}/ubiquiti/binary-amd64/Packages.gz \

Dockerfile.aarch64

@@ -12,6 +12,7 @@ LABEL maintainer="thespad"
 # environment settings
 ARG UNIFI_BRANCH="stable"
 ENV DEBIAN_FRONTEND="noninteractive"
+ENV ENVSUBST_VERSION=v1.4.3
 
 RUN \
   echo "**** install packages ****" && \
@@ -22,6 +23,9 @@ RUN \
     openjdk-17-jre-headless \
     unzip \
     gettext && \
+  curl -L https://github.com/a8m/envsubst/releases/download/${ENVSUBST_VERSION}/envsubst-`uname -s`-`uname -m` -o envsubst && \
+  chmod +x envsubst && \
+  mv envsubst /usr/local/bin && \
   echo "**** install unifi ****" && \
   if [ -z ${UNIFI_VERSION+x} ]; then \
     UNIFI_VERSION=$(curl -sX GET https://dl.ui.com/unifi/debian/dists/${UNIFI_BRANCH}/ubiquiti/binary-amd64/Packages.gz \