Update Dockerfile and add Alpine-based (#320)

* Create Alpine Linux Dockerfile

* Update Dockerfile

* Update Dockerfile.alpine

Author: iamtakingithard

docker/Dockerfile

@@ -1,4 +1,4 @@
-FROM nimlang/nim:1.2.6-ubuntu
+FROM nimlang/nim:1.6.4-ubuntu
 
 RUN apt-get update -yqq \
     && apt-get install -y --no-install-recommends \

docker/Dockerfile.alpine

@@ -0,0 +1,9 @@
+FROM nimlang/nim:1.6.4-alpine
+
+RUN apk --no-cache add libsass-dev sqlite3 libsass
+
+WORKDIR /app
+COPY . /app
+
+# install dependencies
+RUN nimble install -Y