Install envsubst alternative (Go version)

Author: sturman

Dockerfile

@@ -10,8 +10,9 @@ LABEL build_version="Linuxserver.io version:- ${VERSION} Build-date:- ${BUILD_DA
 LABEL maintainer="thespad"
 
 # environment settings
-ARG UNIFI_BRANCH="stable" \
-DEBIAN_FRONTEND="noninteractive"
+ARG UNIFI_BRANCH="stable"
+ARG DEBIAN_FRONTEND="noninteractive"
+ARG ENVSUBST_VERSION=v1.4.2
 
 RUN \
   echo "**** install packages ****" && \
@@ -20,8 +21,10 @@ RUN \
     jsvc \
     logrotate \
     openjdk-17-jre-headless \
-    unzip \
-    gettext && \
+    unzip && \
+  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 http://dl.ui.com/unifi/debian/dists/${UNIFI_BRANCH}/ubiquiti/binary-amd64/Packages \

Dockerfile.aarch64

@@ -10,8 +10,9 @@ LABEL build_version="Linuxserver.io version:- ${VERSION} Build-date:- ${BUILD_DA
 LABEL maintainer="thespad"
 
 # environment settings
-ARG UNIFI_BRANCH="stable" \
-DEBIAN_FRONTEND="noninteractive"
+ARG UNIFI_BRANCH="stable"
+ARG DEBIAN_FRONTEND="noninteractive"
+ARG ENVSUBST_VERSION=v1.4.2
 
 RUN \
   echo "**** install packages ****" && \
@@ -20,8 +21,10 @@ RUN \
     jsvc \
     logrotate \
     openjdk-17-jre-headless \
-    unzip \
-    gettext && \
+    unzip && \
+  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 http://dl.ui.com/unifi/debian/dists/${UNIFI_BRANCH}/ubiquiti/binary-amd64/Packages \