chore: fix dockerfile

Dockerfile

@@ -1,20 +1,23 @@
-FROM messense/rust-musl-cross:x86_64-musl as builder
+FROM rust:1.76.0-alpine3.18 as builder
 
 WORKDIR /usr/src
 
+RUN apk add --no-cache \
+    pkgconfig
+
 COPY Cargo.toml Cargo.lock ./
 COPY src ./src
 
 RUN --mount=type=cache,target=/usr/local/cargo/registry \
     --mount=type=cache,target=/usr/src/target \
-    cargo install --path .
+    cargo build --release
 
 
 FROM alpine as runner
 
 RUN apk --no-cache add ca-certificates
 
-COPY --from=builder /root/.cargo/bin/blackbox-http-discovery .
+COPY --from=builder /usr/src/target/release/blackbox-http-discovery .
 COPY config.yaml .
 
 USER 1000