Refactor Dockerfile for multi-stage build

.dockerignore

@@ -0,0 +1,7 @@
+**
+
+!src/**
+!tools/docker/**
+!Cross.toml
+!Cargo.toml
+!Cargo.lock

Dockerfile

@@ -0,0 +1,18 @@
+FROM docker.io/library/rust:alpine AS builder
+# RUN wget -O source.tar.gz $(wget -qO- https://api.github.com/repos/mbrubeck/agate/releases/latest | sed -nE 's/^.*"tarball_url"\s*:\s*"([^"]+)".*$/\1/p')&& tar xzf source.tar.gz && \
+#     mv mbrubeck-agate-* /agate
+
+WORKDIR /agate
+COPY src src
+COPY Cargo.toml .
+COPY Cargo.lock .
+COPY Cross.toml .
+RUN apk --no-cache add libc-dev && \
+    cargo install --target x86_64-unknown-linux-musl --path .
+
+FROM docker.io/library/alpine:latest
+COPY --from=builder /usr/local/cargo/bin/agate /usr/bin/agate
+WORKDIR /app
+COPY tools/docker/start.sh /app
+ENTRYPOINT ["/bin/sh", "start.sh"]
+

tools/docker/Dockerfile

@@ -1,8 +0,0 @@
-FROM alpine:latest
-RUN apk add cargo && wget -O source.tar.gz $(wget -qO- https://api.github.com/repos/mbrubeck/agate/releases/latest | sed -nE 's/^.*"tarball_url"\s*:\s*"([^"]+)".*$/\1/p')&& tar xzf source.tar.gz && mv /mbrubeck-agate-* /agate && cd agate && cargo build --release
-RUN cp /agate/target/release/agate /usr/bin/agate
-WORKDIR /app
-COPY . /app
-ADD . .
-ENTRYPOINT ["/bin/sh", "start.sh"]
-

tools/docker/start.sh

@@ -1,6 +1,8 @@
 #!/bin/sh
 
-exec agate --content /gmi/ \
-	--hostname ${HOSTNAME} \
-	--lang ${LANG}
+echo "Using hostname ${HOSTNAME:-localhost}"
+echo "Using lang ${LANG:-en-US}"
 
+exec agate --content /gmi/ \
+	--hostname "${HOSTNAME:-localhost}" \
+	--lang "${LANG:-en-US}"