Drop ROS 2 Iron support (Ekumen-OS#454)

### Proposed changes

ROS 2 Iron Irwini reached EOL as of late November 2024 and was
officially phased out a bit over a week ago
https://discourse.ros.org/t/iron-irwini-is-end-of-life/41031. As a
consequence, plain `rosdep resolve` started failing in CI, see Ekumen-OS#452.

We have no reason to continue supporting ROS 2 Iron, thus this patch
drops support for it entirely.

#### Type of change

- [x] 🐛 Bugfix (change which fixes an issue)
- [ ] 🚀 Feature (change which adds functionality)
- [ ] 📚 Documentation (change which fixes or extends documentation)

### Checklist

- [x] Lint and unit tests (if any) pass locally with my changes
- [x] I have added tests that prove my fix is effective or that my
feature works
- [x] I have added necessary documentation (if appropriate)
- [x] All commits have been signed for
[DCO](https://developercertificate.org/)

---------

Signed-off-by: Michel Hidalgo <[email protected]>

.github/workflows/ci_pipeline.yml

@@ -37,7 +37,6 @@ jobs:
         ros_distro:
           - noetic
           - humble
-          - iron
           - jazzy
         include:
           - ros_distro: humble

.github/workflows/docker_ci_pipeline.yml

@@ -23,7 +23,6 @@ jobs:
         ros_distro:
           - noetic
           - humble
-          - iron
           - jazzy
           - rolling
     steps:

.github/workflows/weekly_pipeline.yml

@@ -23,7 +23,6 @@ jobs:
         ros_distro:
           - noetic
           - humble
-          - iron
           - jazzy
           - rolling
     container:

DEVELOPING.md

@@ -38,7 +38,7 @@ To bring up a development environment:
    (cd beluga && ROSDISTRO=humble docker/run.sh)
    ```
 
-   Supported distributions include `noetic`, `humble`, `iron`, `jazzy`, and `rolling`.
+   Supported distributions include `noetic`, `humble`, `jazzy`, and `rolling`.
 
 ## Workflow
 

beluga_tools/package.xml

@@ -11,12 +11,12 @@
   <license>Apache License 2.0</license>
 
 
-  <!-- The released debian for h5py package when on humble or iron seems to have a bug where it's incompatible with numpy's 2.0.0 version.
+  <!-- The released debian for h5py package when on humble seems to have a bug where it's incompatible with numpy's 2.0.0 version.
   We will install newest package version using pip in the development images to circumvent this..
   See:
   https://github.com/h5py/h5py/issues/2353
   -->
-  <exec_depend condition="$ROS_VERSION == 2 and $ROS_DISTRO != 'humble' and $ROS_DISTRO != 'iron'">python3-h5py</exec_depend>
+  <exec_depend condition="$ROS_VERSION == 2 and $ROS_DISTRO != 'humble'">python3-h5py</exec_depend>
   <exec_depend condition="$ROS_VERSION == 2">python3-matplotlib</exec_depend>
   <exec_depend condition="$ROS_VERSION == 2">python3-numpy</exec_depend>
   <exec_depend condition="$ROS_VERSION == 2">python3-scipy</exec_depend>

docs/index.md

@@ -143,10 +143,6 @@ Beluga is supported on a number of ROS 1 and ROS 2 distributions, primarily on L
 :text-align: center
 ![ROS 2 Humble Hawksbill logo](./_images/humble_hawksbill_logo.png)
 :::
-:::{grid-item-card} ROS 2 Iron Irwini
-:text-align: center
-![ROS 2 Iron Irwini logo](./_images/iron_irwini_logo.jpg)
-:::
 :::{grid-item-card} ROS 2 Jazzy Jalisco
 :text-align: center
 ![ROS 2 Jazzy Jalisco logo](./_images/jazzy_jalisco_logo.png)