Build nim from source instead of prebuilts

Signed-off-by: baalajimaestro <me@baalajimaestro.me>

Dockerfile

@@ -1,4 +1,4 @@
-FROM nimlang/nim:alpine as builder
+FROM alpine:edge as builder
 
 RUN apk update && apk add git \
                           build-base \
@@ -10,11 +10,20 @@ RUN apk update && apk add git \
                           sqlite-dev \
                           sqlite-static
 
-COPY . /app
-WORKDIR /app
+ENV NIM_VERSION v1.6.12
+
+RUN git clone https://github.com/nim-lang/Nim.git --depth=1 -b ${NIM_VERSION} && \
+    cd Nim && \
+    bash build_all.sh
+
+# Add built nim to path
+ENV PATH=/Nim/bin:$PATH
 
 RUN nimble install nimble --accept
 
+COPY . /app
+WORKDIR /app
+
 # Build with necessary params to enable statically linking openssl, glibc and sqlite3
 RUN /root/.nimble/bin/nimble build --passL:-L/usr/lib \
                             -d:ssl \