Refactor h2load Dockerfile

- Replaced `as` with `AS` for Dockerfile convention.
- Used `WORKDIR` instead of `cd` for better readability.
- Quoted variables to prevent word splitting and globbing.
- Combined `apk` commands with `--no-cache` to optimize package installation.
- Update OpenSSL

h2load/Dockerfile

@@ -1,31 +1,22 @@
 # Multi-stage build: First the full builder image:
 
-# define the alpine image version to use
+# Define the alpine image version to use
 ARG ALPINE_VERSION=3.20
 
-FROM alpine:${ALPINE_VERSION} as intermediate
-
-ENV DEBIAN_FRONTEND=noninteractive
+# Set the installation directory
+ARG INSTALLDIR=/opt/oqssa
 
-# define the openssl tag to be used
-ARG OPENSSL_TAG=openssl-3.3.2
+FROM alpine:${ALPINE_VERSION} AS intermediate
+ARG INSTALLDIR
 
-# define the liboqs tag to be used
+# Define version tags for dependencies
+ARG OPENSSL_TAG=openssl-3.4.0
 ARG LIBOQS_TAG=0.11.0
-
-# define the oqsprovider tag to be used
 ARG OQSPROVIDER_TAG=0.7.0
-
-# define the nghttp2 tag to be used
 ARG NGHTTP2_TAG=v1.64.0
 
-ARG INSTALLDIR=/opt/oqssa
-
-# Update image and apt software 
-RUN apk update && apk upgrade
-
 # All build prerequisites for the various software packages:
-RUN apk add bash git g++ make cmake ninja autoconf automake libtool \
+RUN apk --no-cache add bash git g++ make cmake ninja autoconf automake libtool \
     libev-dev libevent-dev openssl-dev openssl zlib c-ares-dev pkgconfig \
     linux-headers zlib-dev jansson-dev
 
@@ -38,15 +29,16 @@ RUN git clone --depth 1 --branch ${LIBOQS_TAG} https://github.com/open-quantum-s
     git clone --depth 1 --branch ${NGHTTP2_TAG} https://github.com/nghttp2/nghttp2.git
 
 # build liboqs
-WORKDIR /opt/liboqs
-RUN mkdir build && cd build && cmake -GNinja -DCMAKE_INSTALL_PREFIX=${INSTALLDIR} .. && ninja && ninja install
+WORKDIR /opt/liboqs/build
+RUN cmake -GNinja -DCMAKE_INSTALL_PREFIX=${INSTALLDIR} ..  \
+    && ninja && ninja install
 
 # build openssl 3
 WORKDIR /opt/openssl
-RUN LDFLAGS="-Wl,-rpath -Wl,${INSTALLDIR}/lib64" ./config shared --prefix=${INSTALLDIR} && \
-    make ${MAKE_DEFINES} && make install_sw install_ssldirs && \
-    if [ -d ${INSTALLDIR}/lib64 ]; then ln -s ${INSTALLDIR}/lib64 ${INSTALLDIR}/lib; fi && \
-    if [ -d ${INSTALLDIR}/lib ]; then ln -s ${INSTALLDIR}/lib ${INSTALLDIR}/lib64; fi
+RUN LDFLAGS="-Wl,-rpath -Wl,${INSTALLDIR}/lib64" ./config shared --prefix="${INSTALLDIR}" && \
+    make -j"$(nproc)" && make install_sw install_ssldirs && \
+    if [ -d "${INSTALLDIR}/lib64" ]; then ln -s "${INSTALLDIR}/lib64" "${INSTALLDIR}/lib"; fi && \
+    if [ -d "${INSTALLDIR}/lib" ]; then ln -s "${INSTALLDIR}/lib" "${INSTALLDIR}/lib64"; fi
 
 # build & install provider (and activate by default)
 WORKDIR /opt/oqs-provider
@@ -59,24 +51,22 @@ RUN ln -s ../openssl . && \
     sed -i "s/providers = provider_sect/providers = provider_sect\nssl_conf = ssl_sect\n\n\[ssl_sect\]\nsystem_default = system_default_sect\n\n\[system_default_sect\]\nGroups = \$ENV\:\:KEM_ALG\n/g" /opt/oqssa/ssl/openssl.cnf && \
     sed -i "s/\# Use this in order to automatically load providers/\# Set default KEM alg if not set via environment variable\nKEM_ALG = kyber512\n\n# Use this in order to automatically load providers/g" /opt/oqssa/ssl/openssl.cnf
 
-
 # build nghttp2
 WORKDIR /opt/nghttp2
-RUN LD_LIBRARY_PATH=${INSTALLDIR}/lib64 autoreconf -i && automake && autoconf && ./configure \
-    PKG_CONFIG_PATH="/opt/oqssa/lib64/pkgconfig"  && make -j$(nproc) install
+RUN LD_LIBRARY_PATH="${INSTALLDIR}/lib64" autoreconf -i && automake && autoconf && ./configure \
+    PKG_CONFIG_PATH="/opt/oqssa/lib64/pkgconfig" && make -j"$(nproc)" install
 
 # Copy all required shared object dependencies to a single directory
-RUN mkdir /opt/lib && cd /opt/lib && \
-        cp /usr/local/lib/libnghttp2.so.* . && \
-        cp /usr/lib/libev.so.* . && \
-        cp /opt/oqssa/lib64/libssl.so.* . && \
-        cp /opt/oqssa/lib64/libcrypto.so.* . && \
-        cp /usr/lib/libstdc++.so.* . && \
-        cp /usr/lib/libgcc_s.so.* .
+WORKDIR /opt/lib
+RUN cp /usr/local/lib/libnghttp2.so.* . && \
+    cp /usr/lib/libev.so.* . && \
+    cp /opt/oqssa/lib64/libssl.so.* . && \
+    cp /opt/oqssa/lib64/libcrypto.so.* . && \
+    cp /usr/lib/libstdc++.so.* . && \
+    cp /usr/lib/libgcc_s.so.* .
 
 ## second stage: Only create minimal image without build tooling and intermediate build results generated above:
-FROM alpine:${ALPINE_VERSION} as dev
-ENV DEBIAN_FRONTEND=noninteractive
+FROM alpine:${ALPINE_VERSION} AS dev
 
 # copy executable
 COPY --from=intermediate /usr/local/bin/h2load /usr/local/bin