Create README.md

README.md

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+# scala-on-alpine
+An actually decent Scala image based on Alpine that is still huge because of Scala
+
+# why?
+- The OpenJDK images were orphaned.
+- The `ibmjava` image is huge due to being based on Ubuntu. (see also [the description of the Alpine image comparing it against Ubuntu](https://hub.docker.com/_/alpine))
+- There is not an image dedicated for building Scala apps
+
+# how to use
+```dockerfile
+FROM ghcr.io/sparkles-laurel/scala-on-alpine:0.1.1
+
+RUN apk update && apk upgrade
+
+# Set the working directory
+WORKDIR /app
+
+# Copy the project files
+COPY . /app
+
+# Run sbt to download dependencies and compile the project
+RUN sbt --verbose update && sbt --verbose compile
+
+CMD ["sbt", "run"]
+```