Improve dockerfile

Dockerfile

@@ -1,31 +1,25 @@
 FROM rust:1.68-alpine3.17 AS bin-builder
 
 # Install dependencies
-RUN apk add --no-cache openssl-dev openssl-libs-static musl-dev
+RUN apk add --no-cache openssl-dev musl-dev
 
 # This will build all dependencies and store them in docker's cache.
 # This way, it won't be necessary to recompile everything everytime
-# OPENSSL_STATIC is required, see: https://users.rust-lang.org/t/sigsegv-with-program-linked-against-openssl-in-an-alpine-container/52172 and https://users.rust-lang.org/t/how-to-link-openssl-statically/14912
+# Disable static linking, see: https://users.rust-lang.org/t/sigsegv-with-program-linked-against-openssl-in-an-alpine-container/52172
 COPY backend/Cargo.toml .
 COPY backend/Cargo.lock .
 RUN echo '[[bin]]' >> Cargo.toml && \
     echo 'name = "cache"' >> Cargo.toml && \
     echo 'path = "cache.rs"' >> Cargo.toml && \
     echo 'fn main() {eprintln!("Caching crates...")}' > cache.rs && \
-    export OPENSSL_STATIC=1 && \
-    export OPENSSL_LIB_DIR=/usr/lib && \
-    export OPENSSL_INCLUDE_DIR=/usr/include/openssl && \
-    cargo build --release 
+    RUSTFLAGS='-C target-feature=-crt-static' cargo build --release 
 RUN rm cache.rs && \
     rm Cargo.toml
 
 # Build wimple-wkd
 COPY backend/Cargo.toml .
 COPY backend/src src
-RUN export OPENSSL_STATIC=1 && \
-    export OPENSSL_LIB_DIR=/usr/lib &&\ 
-    export OPENSSL_INCLUDE_DIR=/usr/include/openssl && \
-    cargo build --release
+RUN RUSTFLAGS='-C target-feature=-crt-static' cargo build --release
 
 
 FROM node:19-alpine3.17 AS webpage-builder
@@ -45,8 +39,10 @@ FROM alpine:3.17
 
 # Put everything together
 # It uses user `wkd` for added security
+# Install libgcc, because the executable is dynamically linked to it
 WORKDIR /wkd
-RUN adduser --no-create-home --disabled-password wkd && \
+RUN apk add --no-cache libgcc && \
+    adduser --no-create-home --disabled-password wkd && \
     chown -R wkd:wkd /wkd
 USER wkd
 COPY --from=webpage-builder assets assets