Update Dockerdile, allow to change python version & apline version & …

…fix build error

docker/Dockerfile

@@ -6,18 +6,22 @@ ARG LIBOQS_BUILD_DEFINES="-DOQS_DIST_BUILD=ON -DBUILD_SHARED_LIBS=ON -DOQS_USE_O
 # make build arguments: Adding -j here speeds up build but may tax hardware
 ARG MAKE_DEFINES="-j 2"
 
-FROM alpine:3.16 as intermediate
+# Define default versions for Python and Alpine
+ARG PYTHON_VERSION=3.10.16
+ARG ALPINE_VERSION=3.20
+
+FROM alpine:${ALPINE_VERSION} AS intermediate
 # Take in all global args
 ARG LIBOQS_BUILD_DEFINES
 ARG MAKE_DEFINES
 
 LABEL version="2"
 
-ENV DEBIAN_FRONTEND noninteractive
+ENV DEBIAN_FRONTEND=noninteractive
 
 RUN apk update && apk upgrade
 
-# Get all software packages required for builing all components:
+# Get all software packages required for building all components:
 RUN apk add build-base linux-headers cmake ninja git
 
 # get all sources
@@ -38,7 +42,7 @@ RUN apk add automake autoconf && cd /opt/openssl && LDFLAGS="-Wl,-rpath -Wl,/usr
 RUN wget https://letsencrypt.org/certs/isrgrootx1.pem
 
 ## second stage: Only create minimal image without build tooling and intermediate build results generated above:
-FROM alpine:3.16
+FROM python:${PYTHON_VERSION}-alpine${ALPINE_VERSION}
 
 # Get all software packages required for running all components:
 RUN apk update && apk upgrade && apk add python3
@@ -50,7 +54,7 @@ COPY --from=intermediate /opt/liboqs-python /opt/liboqs-python
 ENV PYTHONPATH=/opt/liboqs-python
 
 # Install liboqs-python
-RUN cd /opt/liboqs-python && python3 setup.py install
+RUN cd /opt/liboqs-python && pip install .
 
 # Enable a normal user 
 RUN addgroup -g 1000 -S oqs && adduser --uid 1000 -S oqs -G oqs