chore: Add w32-mxe Qt 5.15 build

.github/workflows/w32-mxe.yml

@@ -8,6 +8,11 @@ jobs:
     strategy:
       matrix:
         config:
+          - {
+              id: "mxe-qt-5.15",
+              name: "MXE Qt 5.15",
+              docker_image: "fwbuilder/mxe:qt-5.15"
+            }
           - {
               id: "mxe-qt-5.12",
               name: "MXE Qt 5.12",

docker/Dockerfile.mxe_qt-5.15

@@ -0,0 +1,39 @@
+FROM debian:stretch AS builder
+RUN apt-get update && apt-get install -y \
+    autoconf \
+    automake \
+    autopoint \
+    binutils \
+    bison \
+    build-essential \
+    bzip2 \
+    cmake \
+    fakeroot \
+    flex \
+    git \
+    make \
+    gperf \
+    intltool \
+    libgdk-pixbuf2.0-dev \
+    libtool \
+    libtool-bin \
+    libssl-dev \
+    lzip \
+    python \
+    python-mako \
+    p7zip-full \
+    ruby \
+    unzip \
+    wget
+WORKDIR /opt
+RUN git clone https://github.com/mxe/mxe.git
+# Use Qt 5.15.1
+RUN cd mxe && git checkout eb26bce6dd1b4b7a79cdbd9011251e6101bed60d -- src/qtbase.mk
+RUN cd mxe && make MXE_TARGETS='i686-w64-mingw32.shared' -j$(nproc) qtbase libxml2 libxslt
+RUN /opt/mxe/.ccache/bin/ccache -Cz
+
+FROM debian:stretch
+RUN apt-get update && apt-get install -y nsis make git ccache
+WORKDIR /
+COPY --from=builder /opt/mxe /opt/mxe
+CMD ["bash"]