From d2a7831d4cb9319a4e9882577afccee1f33d041c Mon Sep 17 00:00:00 2001
From: Stefano Pigozzi <me@steffo.eu>
Date: Thu, 11 Jul 2024 12:05:07 +0200
Subject: [PATCH] Improve Docker build caching

---
 Dockerfile | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Dockerfile b/Dockerfile
index 2f2ca0ef..fe3bb753 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -60,6 +60,18 @@ RUN \
         apt-get install --assume-yes libpq-dev:armhf; \
     fi
 
+COPY ./Cargo.toml ./Cargo.toml
+COPY ./Cargo.lock ./Cargo.lock
+RUN \
+    if [ "${TARGETPLATFORM}" = "linux/amd64" ]; then \
+        RUSTTARGET=x86_64-unknown-linux-gnu; \
+    elif [ "${TARGETPLATFORM}" = "linux/arm64" ]; then \
+        RUSTTARGET=aarch64-unknown-linux-gnu; \
+    elif [ "${TARGETPLATFORM}" = "linux/arm/v7" ]; then \
+        RUSTTARGET=armv7-unknown-linux-gnueabihf; \
+    fi && \
+    cargo fetch --locked --target=${RUSTTARGET}
+
 COPY ./ ./
 
 # This has reached a new level of hack