dockerfile: optimize on size and network call

- merge multiple steps to reduce number of layers
- run make clean to reduce layer size
- run cargo clean
- merge multiple ARG into single step
Signed-off-by: Lakshya Singh <lakshay.singh1108@gmail.com>

txood/Dockerfile

@@ -6,16 +6,16 @@ WORKDIR /build
 RUN apk update && \
     apk add \
     git \
-    rust
-
-RUN apk add cargo
+    rust \
+    cargo
 
 ARG TXOO_GIT_HASH=528fa92e5def1b6cc19127f2242137bf6f13550d
 ARG TXOO_REPO=https://gitlab.com/lightning-signer/txoo.git
 RUN git clone --recurse-submodules $TXOO_REPO
 RUN cd txoo && \
     git checkout $TXOO_GIT_HASH && \
-    cargo build --release -p txood
+    cargo install --path ./txood --bin txood --profile release --root /usr/local/ && \
+    cargo clean
 
 # txoo runner
 FROM --platform=${TARGETPLATFORM:-${BUILDPLATFORM:-linux/amd64}} alpine:3.18 as runner
@@ -32,7 +32,7 @@ RUN apk update && \
       libev-dev \
       curl-dev
 
-COPY --from=builder /build/txoo/target/release/txood /usr/bin/txood
+COPY --from=builder /usr/local/bin/txood /usr/bin/txood
 
 COPY entrypoint.sh /entrypoint.sh
 RUN chmod +x /entrypoint.sh