try arm builds

Dockerfile.builddeps

@@ -0,0 +1,17 @@
+FROM cache.coadcorp.com/library/ubuntu:22.04
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update \
+  && apt-get install -y --no-install-recommends \
+    build-essential \
+    qt5-qmake \
+    qtbase5-dev \
+    qtbase5-dev-tools \
+    libexif-dev \
+    qt5-image-formats-plugins \
+    libmosquitto-dev \
+    dpkg-dev \
+    fakeroot \
+    ca-certificates \
+  && rm -rf /var/lib/apt/lists/*