Add option to build with different database types (#13)

* Add argument for database type

The optional argument "-d" allows to customize the database type.

* Modify patch to work with all db types

* Add database type to filename

* Add dynamic modification of systemd-unit

Dynamically changes the systemd-unit to require the appropriate database service.

Dockerfile.patch

@@ -22,7 +22,7 @@
  
  # Make sure that we actually build the project
  RUN touch src/main.rs
-@@ -62,34 +62,25 @@
+@@ -62,10 +62,6 @@
  # because we already have a binary built
  FROM debian:buster-slim
  
@@ -30,15 +30,13 @@
 -ENV ROCKET_PORT=80
 -ENV ROCKET_WORKERS=10
 -
--# Install needed libraries
--RUN apt-get update && apt-get install -y \
--    --no-install-recommends \
--    openssl \
--    ca-certificates \
--    curl \
--    sqlite3 \
--    && rm -rf /var/lib/apt/lists/*
--
+ # Install needed libraries
+ RUN apt-get update && apt-get install -y \
+     --no-install-recommends \
+@@ -75,21 +71,25 @@
+     sqlite3 \
+     && rm -rf /var/lib/apt/lists/*
+ 
 -RUN mkdir /data
 -VOLUME /data
 -EXPOSE 80