Add a repos file for ros-infrastructure packages (#4)

This isn't used by the CI automation defined here, but will be used by
other CI automation to test HEAD of all of our packages together.

constraints-heads.txt

@@ -1,3 +1,4 @@
+# Should mirror ros-infrastructure.repos
 bloom@ git+https://github.com/ros-infrastructure/bloom.git
 catkin-pkg@ git+https://github.com/ros-infrastructure/catkin_pkg.git
 catkin-sphinx@ git+https://github.com/ros-infrastructure/catkin-sphinx.git

ros-infrastructure.repos

@@ -0,0 +1,43 @@
+---
+# Should mirror constraints-heads.txt
+repositories:
+  bloom:
+    type: git
+    url: https://github.com/ros-infrastructure/bloom.git
+    version: master
+  catkin_pkg:
+    type: git
+    url: https://github.com/ros-infrastructure/catkin_pkg.git
+    version: master
+  catkin-sphinx:
+    type: git
+    url: https://github.com/ros-infrastructure/catkin-sphinx.git
+    version: master
+  ros_buildfarm:
+    type: git
+    url: https://github.com/ros-infrastructure/ros_buildfarm.git
+    version: master
+  rosdep:
+    type: git
+    url: https://github.com/ros-infrastructure/rosdep.git
+    version: master
+  rosdistro:
+    type: git
+    url: https://github.com/ros-infrastructure/rosdistro.git
+    version: master
+  rosdoc2:
+    type: git
+    url: https://github.com/ros-infrastructure/rosdoc2.git
+    version: main
+  rosinstall_generator:
+    type: git
+    url: https://github.com/ros-infrastructure/rosinstall_generator.git
+    version: master
+  rospkg:
+    type: git
+    url: https://github.com/ros-infrastructure/rospkg.git
+    version: master
+  superflore:
+    type: git
+    url: https://github.com/ros-infrastructure/superflore.git
+    version: master