docker: put the static libdbus on CMAKE_PREFIX_PATH for Qt6::DBus consumers

The Qt build found dbus via -DDBus1_DIR, but a static Qt records the dependency
and every consumer re-runs find_package(DBus1) through Qt's exported config
(Qt6Gui -> Qt6DBus -> find_dependency(WrapDBus1)). Without the dbus prefix on
the consumer's search path that fails:

  Could NOT find WrapDBus1 (missing: DBus1_LIBRARY DBus1_INCLUDE_DIR ...)
  Qt6DBus could not be found because dependency WrapDBus1 could not be found.

Add /opt/dbus-<ver>-static to the image's CMAKE_PREFIX_PATH env so the viewer
build (and the CI .deb/.rpm and tarball builds) resolve it. Verified against the
rocky9 image: find_package(Qt6 ... DBus) fails with the old path and passes with
dbus on the env CMAKE_PREFIX_PATH.

Also make build_in_rocky9.sh self-sufficient on images built before this fix:
it discovers /opt/dbus-*-static/lib/cmake/DBus1 and passes -DDBus1_DIR, so the
viewer verification works without rebuilding the image first.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docker/build_in_rocky9.sh

@@ -28,8 +28,13 @@ docker run --rm \
     "$IMG" bash -lc '
         set -eux
         git config --global --add safe.directory /workspace || true
+        # If this image predates the CMAKE_PREFIX_PATH fix, point cmake at the static libdbus config
+        # dir so the viewer (Qt6::DBus -> find_package(DBus1)) resolves WrapDBus1. Harmless once the
+        # image ENV already carries it.
+        dbus_dir=$(ls -d /opt/dbus-*-static/lib/cmake/DBus1 2>/dev/null | head -1)
         cmake -G Ninja -S /workspace -B /tmp/build \
             -DJFJOCH_VIEWER_ONLY=ON -DJFJOCH_USE_CUDA=ON \
+            ${dbus_dir:+-DDBus1_DIR=$dbus_dir} \
             -DCMAKE_BUILD_TYPE=Release \
             -DCMAKE_CXX_FLAGS="-march=x86-64-v3" -DCMAKE_C_FLAGS="-march=x86-64-v3"
         ninja -C /tmp/build -j"$(nproc)" jfjoch_viewer

docker/rocky8/Dockerfile

@@ -168,8 +168,10 @@ RUN set -eux; \
     cmake --install eigen-build; \
     cd /; rm -rf /tmp/eigen /tmp/eigen-build
 
-# Make Qt and Eigen discoverable by CMake
-ENV CMAKE_PREFIX_PATH=/opt/qt-${QT_VERSION}-static:/opt/eigen-3.4
+# Make Qt, the static libdbus, and Eigen discoverable by CMake. The static libdbus prefix is
+# required here (not only at Qt build time): every Qt6::DBus consumer re-runs find_package(DBus1)
+# through Qt's exported config, so DBus1Config.cmake must be on CMAKE_PREFIX_PATH for the viewer build.
+ENV CMAKE_PREFIX_PATH=/opt/qt-${QT_VERSION}-static:/opt/dbus-${DBUS_VERSION}-static:/opt/eigen-3.4
 
 # Set workdir for your project
 WORKDIR /workspace

docker/rocky9/Dockerfile

@@ -207,8 +207,10 @@ RUN set -eux; \
     cmake --install eigen-build; \
     cd /; rm -rf /tmp/eigen /tmp/eigen-build
 
-# Make Qt and Eigen discoverable by CMake
-ENV CMAKE_PREFIX_PATH=/opt/qt-${QT_VERSION}-static:/opt/eigen-3.4
+# Make Qt, the static libdbus, and Eigen discoverable by CMake. The static libdbus prefix is
+# required here (not only at Qt build time): every Qt6::DBus consumer re-runs find_package(DBus1)
+# through Qt's exported config, so DBus1Config.cmake must be on CMAKE_PREFIX_PATH for the viewer build.
+ENV CMAKE_PREFIX_PATH=/opt/qt-${QT_VERSION}-static:/opt/dbus-${DBUS_VERSION}-static:/opt/eigen-3.4
 
 ENV LANG=en_US.UTF-8
 ENV LANGUAGE=en_US:en

docker/ubuntu2204/Dockerfile

@@ -196,8 +196,10 @@ RUN set -eux; \
     cmake --install eigen-build; \
     cd /; rm -rf /tmp/eigen /tmp/eigen-build
 
-# Make Qt and Eigen discoverable by CMake
-ENV CMAKE_PREFIX_PATH=/opt/qt-${QT_VERSION}-static:/opt/eigen-3.4
+# Make Qt, the static libdbus, and Eigen discoverable by CMake. The static libdbus prefix is
+# required here (not only at Qt build time): every Qt6::DBus consumer re-runs find_package(DBus1)
+# through Qt's exported config, so DBus1Config.cmake must be on CMAKE_PREFIX_PATH for the viewer build.
+ENV CMAKE_PREFIX_PATH=/opt/qt-${QT_VERSION}-static:/opt/dbus-${DBUS_VERSION}-static:/opt/eigen-3.4
 
 # Set workdir for your project
 WORKDIR /workspace

docker/ubuntu2404/Dockerfile

@@ -183,8 +183,10 @@ RUN set -eux; \
     cmake --install eigen-build; \
     cd /; rm -rf /tmp/eigen /tmp/eigen-build
 
-# Make Qt and Eigen discoverable by CMake
-ENV CMAKE_PREFIX_PATH=/opt/qt-${QT_VERSION}-static:/opt/eigen-3.4
+# Make Qt, the static libdbus, and Eigen discoverable by CMake. The static libdbus prefix is
+# required here (not only at Qt build time): every Qt6::DBus consumer re-runs find_package(DBus1)
+# through Qt's exported config, so DBus1Config.cmake must be on CMAKE_PREFIX_PATH for the viewer build.
+ENV CMAKE_PREFIX_PATH=/opt/qt-${QT_VERSION}-static:/opt/dbus-${DBUS_VERSION}-static:/opt/eigen-3.4
 
 # Set workdir for your project
 WORKDIR /workspace