Add multi stage dockerfile and fix source URL

Dockerfile

@@ -1,6 +1,14 @@
-FROM java:8
+FROM clojure:openjdk-16-alpine AS builder
+RUN mkdir -p /app
+WORKDIR /app
+COPY project.clj /app
+RUN lein deps
+COPY . /app
+RUN mv "$(lein uberjar | sed -n 's/^Created \(.*standalone\.jar\)/\1/p')" app-standalone.jar
 
-ADD buchdesmonats-1.7.jar /buchdesmonats/
-WORKDIR /buchdesmonats
-
-CMD ["java", "-jar", "buchdesmonats-1.7.jar"]
+FROM openjdk:16
+RUN mkdir -p /app/public
+WORKDIR /app
+COPY --from=builder /app/app-standalone.jar /app/bdm.jar
+# Make sure you mount the public folder
+CMD java -jar bdm.jar $TYPE

README.mkd

@@ -11,6 +11,21 @@ list. This includes books and comics.
 
     $ target/buchdesmonats-1.7-standalone.jar [book|comic]
     
+## Docker
+
+You can use the Dockerfile to generate the static content. This is useful
+for a cronjob. You want to mount the target dir, so it is not lost after
+the container stops. The Dockerfile is a multi stage dockerfile, which
+first compiles the clojure files into a standalone jar file and then use
+it to generate the book of the month content.
+
+    $ docker build . -t bdm:1.7
+    
+Run this periodically:
+
+    $ docker run -it -v "$PWD/public:/app/public" -e "TYPE=book" bdm:1.7
+    $ docker run -it -v "$PWD/public:/app/public" -e "TYPE=comic" bdm:1.7
+    
 ## Authors
 
 * Programming: [Aaron Fischer](https://aaron-fischer.net/)

src/buchdesmonats/core.clj

@@ -81,7 +81,7 @@
 
 (defn -main [& args]
   (let [type (first args)
-        datasource-url (str "https://git.okoyono.de/mezzomix/buch_des_monats/raw/master/" (clojure.string/upper-case type) ".mkd")
+        datasource-url (str "https://git.okoyono.de/mezzo/buch_des_monats/raw/master/" (clojure.string/upper-case type) ".mkd")
         target-dir (io/file "public" (str type "-covers"))]
     (fs/mkdirs target-dir)
     (generate-html type (scrape-book-urls datasource-url) "public")