Add container customizer (#280)

builder/.gitignore

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+build

builder/Dockerfile

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+FROM ghcr.io/engineer-man/piston:latest
+ADD . /piston/packages/

builder/build.sh

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+#!/usr/bin/env bash
+
+# Build a container using the spec file provided
+
+help_msg(){
+    echo "Usage: $0 [specfile] [tag]"
+    echo
+    echo "$1"
+
+    exit 1
+}
+
+cleanup(){
+    echo "Exiting..."
+    docker stop builder_piston_instance && docker rm builder_piston_instance
+}
+
+fetch_packages(){
+    local port=$((5535 + $RANDOM % 60000))
+    mkdir build
+    # Start a piston container
+    docker run \
+        -v "$PWD/build":'/piston/packages' \
+        --tmpfs /piston/jobs \
+        -dit \
+        -p $port:2000 \
+        --name builder_piston_instance \
+        ghcr.io/engineer-man/piston
+    
+    # Ensure the CLI is installed
+    cd ../cli
+    npm i
+    cd -
+
+    # Evalulate the specfile
+    ../cli/index.js -u "http://127.0.0.1:$port" ppman spec $1   
+}
+
+build_container(){
+    docker build -t $1 -f "$(dirname $0)/Dockerfile" "$PWD/build"
+}
+
+
+SPEC_FILE=$1
+TAG=$2
+
+[ -z "$SPEC_FILE" ] && help_msg "specfile is required"
+[ -z "$TAG" ] && help_msg "tag is required"
+
+[ -f "$SPEC_FILE" ] || help_msg "specfile does not exist"
+
+which node || help_msg "nodejs is required"
+which npm || help_msg "npm is required"
+
+trap cleanup EXIT
+
+fetch_packages $SPEC_FILE
+build_container $TAG
+
+echo "Start your custom piston container with"
+echo "$ docker run --tmpfs /piston/jobs -dit -p 2000:2000 $TAG"