docker: commit dockerfile variants for static/dynamic linking

docker/win64-cross-qt-mxe-dynamic.Dockerfile

@@ -0,0 +1,19 @@
+FROM debian:bookworm
+
+RUN DEBIAN_FRONTEND=noninteractive apt-get update && \
+    apt-get install -qyy gnupg2 golang-go ca-certificates
+
+RUN DEBIAN_FRONTEND=noninteractive \
+    echo "deb https://pkg.mxe.cc/repos/apt buster main" >/etc/apt/sources.list.d/mxeapt.list && \
+    apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 86B72ED9 && \
+    apt-get update && \
+    apt-get install -qyy mxe-x86-64-w64-mingw32.shared-qt5 && \
+    apt-get clean
+
+ENV PATH=/usr/lib/mxe/usr/bin:$PATH
+
+ENV CXX=x86_64-w64-mingw32.shared-g++
+ENV CC=x86_64-w64-mingw32.shared-gcc
+ENV PKG_CONFIG=x86_64-w64-mingw32.shared-pkg-config
+ENV GOOS=windows
+ENV CGO_ENABLED=1