Switch stack to container

Dockerfile

@@ -0,0 +1,28 @@
+# Copied from https://github.com/sleepyfox/janet-lang-docker/blob/master/Dockerfile
+
+FROM ubuntu:19.10
+
+# Install make
+RUN apt -q update && apt install -yq make gcc git curl
+
+# Install Janet
+RUN cd /tmp && \
+    git clone https://github.com/janet-lang/janet.git && \
+    cd janet && \
+    make all test install && \
+    rm -rf /tmp/janet
+RUN chmod 777 /usr/local/lib/janet
+
+# Set group and user IDs for docker user
+ARG GID=1000
+ARG UID=1000
+ARG USER=me
+
+# Create the group and user
+RUN groupadd -g $GID $USER
+RUN useradd -g $GID -M -u $UID -d /var/app $USER
+
+# Application setup
+WORKDIR /var/app
+RUN chmod 777 /var/app
+USER $USER

heroku.yml

@@ -0,0 +1,5 @@
+build:
+  docker:
+    web: Dockerfile
+run:
+  web: ./build/main