build: reduce podman/docker image size

.dockerignore

@@ -0,0 +1,6 @@
+.env
+target/
+tests/
+Dockerfile
+scripts/
+migrations/

Dockerfile

@@ -1,8 +1,20 @@
-FROM docker.io/rust:1.75.0
+# Builder stage
+FROM rust:1.75.0 AS builder
+
 WORKDIR /app
 RUN apt update && apt install lld clang -y
 COPY . .
 ENV SQLX_OFFLINE true
 RUN cargo build --release
+
+# Runtime stage
+FROM rust:1.75.0-slim AS runtime
+
+WORKDIR /app
+# Copy the compiled binary from the builder environment 
+# to our runtime environment
+COPY --from=builder /app/target/release/learn_axum zero2prod
+# We need the configuration file at runtime!
+COPY configuration configuration
 ENV APP_ENVIRONMENT production
-ENTRYPOINT ["./target/release/learn_axum"]
+ENTRYPOINT ["./zero2prod"]