Merge pull request #155 from Dreamacro/docker-build

Fix Dockerfile build broken

Dockerfile

@@ -1,24 +1,22 @@
 # Build stage
-FROM rust:1.45.0 as cargo-build
+FROM rust:1.60-alpine3.15 as cargo-build
 
-RUN apt-get update && \
-    apt-get install -y --no-install-recommends musl-tools
-RUN rustup target add x86_64-unknown-linux-musl
+RUN apk add --no-cache musl-dev pkgconfig openssl-dev
 
 WORKDIR /src/websocat
 
 COPY Cargo.toml Cargo.toml
 
 RUN mkdir src/ &&\
     echo "fn main() {println!(\"if you see this, the build broke\")}" > src/main.rs && \
-    RUSTFLAGS=-Clinker=musl-gcc cargo build --release --target=x86_64-unknown-linux-musl && \
+    cargo build --release --target=x86_64-unknown-linux-musl && \
     rm -f target/x86_64-unknown-linux-musl/release/deps/websocat*
 
 COPY . .
-RUN RUSTFLAGS=-Clinker=musl-gcc cargo build --release --target=x86_64-unknown-linux-musl
+RUN cargo build --release --target=x86_64-unknown-linux-musl
 
 # Final stage
-FROM alpine:3.12.0
+FROM alpine:3.15
 
 WORKDIR /
 COPY --from=cargo-build /src/websocat/target/x86_64-unknown-linux-musl/release/websocat /usr/local/bin