Added tshock server; moved env vars to .env file

tshock/Dockerfile

@@ -0,0 +1,37 @@
+FROM alpine:latest AS base
+
+# Build arguments
+ARG RELEASE_TAG
+
+# Add unzip & curl
+RUN apk update && apk add --no-cache unzip curl
+
+WORKDIR /terraria
+
+# Download & unzip
+# TODO convert this to jq?
+RUN curl -s "https://api.github.com/repos/Pryaxis/TShock/releases/tags/${RELEASE_TAG}" | \
+grep "browser_download_url" | \
+grep -o "https[^\"]\+" | \
+xargs curl -sLo tshock.zip && \
+unzip tshock.zip && \
+rm tshock.zip && \
+# Is there a better way to do this?
+mv TShock* tshock
+
+
+FROM mono:latest
+WORKDIR /terraria
+
+COPY --from=base /terraria/tshock /terraria
+
+# Create worlds directory & symlink it
+RUN mkdir -p worlds logs config /root/.local/share/Terraria && \
+ln -s /terraria/worlds /root/.local/share/Terraria/Worlds
+
+ENTRYPOINT \
+    mono /terraria/TerrariaServer.exe \
+    -configpath /terraria/config \
+    -logpath /terraria/logs \
+    -autocreate "$AUTOCREATE" \
+    -world /terraria/worlds/Main.wld