CI/CD: Implement weekly builds.

Brings over the functionality in https://github.com/FreeCAD/FreeCAD-Bundle
to build Linux AppImage, macOS .dmg, and Windows 7z releases.

This version also creates a tagged release for each build, creating an
archive of the weekly builds as well as the ability to easily tie each
build to a git commit.  This will make running 'git bisect' easy to
identify sources of regressions.

package/rattler-build/build.sh

@@ -0,0 +1,47 @@
+if [[ ${HOST} =~ .*linux.*  ]]; then
+    CMAKE_PRESET=conda-linux-release
+fi
+
+if [[ ${HOST} =~ .*darwin.* ]]; then
+    CMAKE_PRESET=conda-macos-release
+
+    # add hacks for osx here!
+    echo "adding hacks for osx"
+
+    # install space-mouse
+    /usr/bin/curl -o /tmp/3dFW.dmg -L 'https://download.3dconnexion.com/drivers/mac/10-7-0_B564CC6A-6E81-42b0-82EC-418EA823B81A/3DxWareMac_v10-7-0_r3411.dmg'
+    hdiutil attach -readonly /tmp/3dFW.dmg
+    sudo installer -package /Volumes/3Dconnexion\ Software/Install\ 3Dconnexion\ software.pkg -target /
+    diskutil eject /Volumes/3Dconnexion\ Software
+    CMAKE_PLATFORM_FLAGS+=(-DFREECAD_USE_3DCONNEXION:BOOL=ON)
+    CMAKE_PLATFORM_FLAGS+=(-D3DCONNEXIONCLIENT_FRAMEWORK:FILEPATH="/Library/Frameworks/3DconnexionClient.framework")
+
+    CXXFLAGS="${CXXFLAGS} -D_LIBCPP_DISABLE_AVAILABILITY"
+fi
+
+unset CMAKE_GENERATOR
+unset CMAKE_GENERATOR_PLATFORM
+
+cmake \
+    --preset ${CMAKE_PRESET} \
+    -D CMAKE_IGNORE_PREFIX_PATH="/opt/homebrew;/usr/local/homebrew" \
+    -D CMAKE_INCLUDE_PATH:FILEPATH="$PREFIX/include" \
+    -D CMAKE_INSTALL_LIBDIR:FILEPATH="$PREFIX/lib" \
+    -D CMAKE_INSTALL_PREFIX:FILEPATH="$PREFIX" \
+    -D CMAKE_LIBRARY_PATH:FILEPATH="$PREFIX/lib" \
+    -D CMAKE_PREFIX_PATH:FILEPATH="$PREFIX" \
+    -D FREECAD_USE_OCC_VARIANT="Official Version" \
+    -D INSTALL_TO_SITEPACKAGES:BOOL=ON \
+    -D OCC_INCLUDE_DIR:FILEPATH="$PREFIX/include" \
+    -D OCCT_CMAKE_FALLBACK:BOOL=OFF \
+    -D Python_EXECUTABLE:FILEPATH="$PYTHON" \
+    -D Python3_EXECUTABLE:FILEPATH="$PYTHON" \
+    -B build \
+    -S . \
+    ${CMAKE_PLATFORM_FLAGS[@]}
+
+cmake --build build
+cmake --install build
+
+mv ${PREFIX}/bin/FreeCAD ${PREFIX}/bin/freecad || true
+mv ${PREFIX}/bin/FreeCADCmd ${PREFIX}/bin/freecadcmd || true