feat: add dart-lang image

dart/2.17/Dockerfile

@@ -0,0 +1,14 @@
+FROM        --platform=$TARGETOS/$TARGETARCH dart:2.17
+
+LABEL       author="Alden Bansemer" maintainer="alden@knoban.com"
+
+RUN         apt update \
+            && apt -y install iproute2 git ca-certificates tzdata \
+            && useradd -m -d /home/container container
+
+USER        container
+ENV         USER=container HOME=/home/container
+WORKDIR     /home/container
+
+COPY        ./../entrypoint.sh /entrypoint.sh
+CMD         [ "/bin/bash", "/entrypoint.sh" ]

dart/entrypoint.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+cd /home/container
+
+# Make internal Docker IP address available to processes
+INTERNAL_IP=$(ip route get 1 | awk '{print $(NF-2);exit}')
+export INTERNAL_IP
+
+# Print Dart version
+dart --version
+
+# Replace startup variables
+MODIFIED_STARTUP=$(echo -e ${STARTUP} | sed -e 's/{{/${/g' -e 's/}}/}/g')
+echo ":/home/container$ ${MODIFIED_STARTUP}"
+
+# Run the server
+eval ${MODIFIED_STARTUP}