Generate Dockerfiles from one source for maintainability. Closes #785.

docker/amd64/postgresql/Dockerfile.alpine

@@ -1,4 +1,4 @@
-# Using multistage build: 
+# Using multistage build:
 # 	https://docs.docker.com/develop/develop-images/multistage-build/
 # 	https://whitfin.io/speeding-up-rust-docker-builds/
 ####################### VAULT BUILD IMAGE  #######################
@@ -15,7 +15,7 @@ RUN apk add --no-cache --upgrade \
 RUN mkdir /web-vault
 WORKDIR /web-vault
 
-SHELL ["/bin/ash", "-eo", "pipefail", "-c"]
+SHELL ["/bin/ash", "-o", "nounset", "-o", "pipefail", "-o", "errexit", "-c"]
 
 RUN curl -L $URL | tar xz
 RUN ls
@@ -32,24 +32,38 @@ RUN rustup set profile minimal
 
 ENV USER "root"
 
-# Install needed libraries
+# Install PostgreSQL package
 RUN apt-get update && apt-get install -y \
     --no-install-recommends \
     libpq-dev \
     && rm -rf /var/lib/apt/lists/*
 
+# Creates a dummy project used to grab dependencies
+RUN USER=root cargo new --bin app
 WORKDIR /app
 
+# Copies over *only* your manifests and build files
+COPY ./Cargo.* ./
+COPY ./rust-toolchain ./rust-toolchain
+COPY ./build.rs ./build.rs
+
+# Builds your dependencies and removes the
+# dummy project, except the target folder
+# This folder contains the compiled dependencies
+RUN cargo build --features ${DB} --release
+RUN find . -not -path "./target*" -delete
+
 # Copies the complete project
 # To avoid copying unneeded files, use .dockerignore
 COPY . .
 
-RUN rustup target add x86_64-unknown-linux-musl
-
 # Make sure that we actually build the project
 RUN touch src/main.rs
 
-# Build
+RUN rustup target add x86_64-unknown-linux-musl
+
+# Builds again, this time it'll just be
+# your actual source files being built
 RUN cargo build --features ${DB} --release
 
 ######################## RUNTIME IMAGE  ########################
@@ -62,12 +76,12 @@ ENV ROCKET_PORT=80
 ENV ROCKET_WORKERS=10
 ENV SSL_CERT_DIR=/etc/ssl/certs
 
+
 # Install needed libraries
 RUN apk add --no-cache \
         openssl \
-        postgresql-libs \
         curl \
-        sqlite \
+        postgresql-libs \
         ca-certificates
 
 RUN mkdir /data