Copy migrations directory in Dockerfile for sqlx::migrate!() macro

The sqlx::migrate!() macro embeds migrations at compile time and
requires the migrations directory to exist during cargo build.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: haasonsaas

Dockerfile

@@ -16,6 +16,7 @@ WORKDIR /app
 
 # Cache dependencies
 COPY Cargo.toml Cargo.lock ./
+COPY migrations ./migrations
 RUN mkdir src && echo 'fn main() {}' > src/main.rs && \
     mkdir -p web/dist && \
     cargo build --release && \