Build docker image. Add run.sh

Dockerfile

@@ -0,0 +1,10 @@
+FROM alpine:3.8
+COPY entrypoint.sh /entrypoint.sh
+WORKDIR /app
+RUN apk add --no-cache php7 && \
+    chmod +x /entrypoint.sh && \
+    chown -R nobody:nobody /entrypoint.sh
+
+USER nobody
+
+ENTRYPOINT ["/entrypoint.sh"]

entrypoint.sh

@@ -0,0 +1,13 @@
+#!/bin/sh
+if [ $# -eq 1 ]; then
+    php $1/a.php
+    php $1/b.php
+    exit 1
+elif [ $# -eq 2 ]; then
+    php $1/$2.php
+    exit 1
+else
+  echo "Need some parameters."
+fi
+
+exec "$@"

run.sh

@@ -1,10 +1,9 @@
-#!/bin/sh
-if [ $# -eq 1 ]; then
-    docker run --rm -it -v $PWD:/app -w /app php:7.3-rc-cli php $1/a.php
-    docker run --rm -it -v $PWD:/app -w /app php:7.3-rc-cli php $1/b.php
-    exit 1
-fi
-if [ $# -eq 2 ]; then
-    docker run --rm -it -v $PWD:/app -w /app php:7.3-rc-cli php $1/$2.php
-    exit 1
+#!/bin/bash
+IMAGE=greboid/aoc-2018
+docker image inspect $IMAGE >/dev/null 2>&1
+if [ $? -ne 0 ]
+then
+    echo "One time setup: building docker image..."
+    docker build . -t $IMAGE
 fi
+docker run --rm -it -v $(pwd):/app $IMAGE $@