Add Ubuntu 26.04 LTS (Resolute Raccoon) support

- Update Makefile, azure_targets.sh, init-sig.sh with ubuntu-2604 targets
- Remove Azure CVM target
- Replace deprecated apt_key with signed-by keyring approach (all roles)
- Map Azure CLI codename resolute->noble (no MS repo for 26.04 yet)
- Set QEMU memory to 4GB for Ubuntu 26.04
- Update README.md and all provider docs

Author: Whisper40

README.md

@@ -35,6 +35,7 @@ The table below shows the currently provided operating systems for each provider
 | Rocky Linux 9     | ❌ | ❌ | ❌ | ❌ | ✅ | ❌ | ❌ | ✅ | ❌ | ✅ | ❌ | 💙 | ❌ | ✅ | ✅ | ❌ | ✅ | ❌ |
 | Ubuntu 22.04      | ✅ | 💙 | ✅ | 💙 | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | 💙 | ❌ | ✅ | ✅ | ✅ | ✅ | ✅ |
 | Ubuntu 24.04      | ✅ | 💙 | ✅ | 💙 | ✅ | ❌ | ✅ | ✅ | ❌ | ✅ | ✅ | 💙 | ❌ | ✅ | ✅ | ✅ | ✅ | ✅ |
+| Ubuntu 26.04      | ✅ | 💙 | ✅ | 💙 | ✅ | ❌ | ✅ | ✅ | ❌ | ✅ | ✅ | 💙 | ❌ | ✅ | ✅ | ✅ | ✅ | ✅ |
 | Windows 2019      | ✅ | 💙 | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ | ✅ | ❌ | ❌ | ✅ | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ |
 | Windows 2022      | ❌ | 💙 | ❌ | ❌ | ❌ | ❌ | ❌ | ✅ | ✅ | ❌ | ❌ | ✅ | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ |
 | Windows 2025      | ❌ | 💙 | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ |

docs/book/src/capi/providers/3dsoutscale.md

@@ -28,6 +28,7 @@ the different operating systems.
 |------|-------------|
 | `ubuntu-2204.json` | The settings for the Ubuntu 22.04 image |
 | `ubuntu-2404.json` | The settings for the Ubuntu 24.04 image |
+| `ubuntu-2604.json` | The settings for the Ubuntu 26.04 image |
 
 You must have your [Access Keys](https://docs.outscale.com/en/userguide/About-Access-Keys.html).
 You must have your [Account Id](https://docs.outscale.com/en/userguide/Getting-Information-About-Your-Account-and-Quotas.html).

docs/book/src/capi/providers/aws.md

@@ -46,6 +46,7 @@ the different operating systems.
 | `rockylinux.json`    | The settings for the Rocky Linux image    |
 | `ubuntu-2204.json`   | The settings for the Ubuntu 22.04 image   |
 | `ubuntu-2404.json`   | The settings for the Ubuntu 24.04 image   |
+| `ubuntu-2604.json`   | The settings for the Ubuntu 26.04 image   |
 | `windows-2019.json`  | The settings for the Windows 2019 image   |
 
 

docs/book/src/capi/providers/digitalocean.md

@@ -27,3 +27,4 @@ the different operating systems.
 |------|-------------|
 | `ubuntu-2204.json` | The settings for the Ubuntu 22.04 image |
 | `ubuntu-2404.json` | The settings for the Ubuntu 24.04 image |
+| `ubuntu-2604.json` | The settings for the Ubuntu 26.04 image |

docs/book/src/capi/providers/gcp.md

@@ -50,6 +50,7 @@ The `gce` sub-directory inside `images/capi/packer` stores JSON configuration fi
 | -------- | --------
 | `ubuntu-2204.json`     | Settings for Ubuntu 22.04 image     |
 | `ubuntu-2404.json`     | Settings for Ubuntu 24.04 image     |
+| `ubuntu-2604.json`     | Settings for Ubuntu 26.04 image     |
 
 #### Common GCP options
 

docs/book/src/capi/providers/hcloud.md

@@ -29,3 +29,4 @@ the different operating systems.
 | `rockylinux-9.json`  | The settings for the RockyLinux 9 image  |
 | `ubuntu-2204.json`   | The settings for the Ubuntu 22.04 image  |
 | `ubuntu-2404.json`   | The settings for the Ubuntu 24.04 image  |
+| `ubuntu-2604.json`   | The settings for the Ubuntu 26.04 image  |

docs/book/src/capi/providers/maas.md

@@ -19,7 +19,7 @@ From the `image-builder` directory, run:
 make build-maas-ubuntu-xxxx-efi
 ```
 
-The image will be located in `images/capi/output/BUILD_NAME+kube-KUBERNETES_VERSION`. Replace `xxxx` with `2204` or `2404`, depending on the Ubuntu version.
+The image will be located in `images/capi/output/BUILD_NAME+kube-KUBERNETES_VERSION`. Replace `xxxx` with `2204`, `2404` or `2604`, depending on the Ubuntu version.
 
 To build a Ubuntu 22.04-based CAPI image:
 
@@ -73,7 +73,7 @@ Use the **.tar.gz** file for the upload:
 maas admin boot-resources create name=custom/your-image architecture=amd64/generic title=your-image subarches=generic base_image=ubuntu/jammy content@=./ubuntu-2204-efi-kube-v1.30.5.tar.gz
 ```
 
-**Note:** Set `base_image=ubuntu/jammy` for Ubuntu 22.04 or `ubuntu/noble` for 24.04.
+**Note:** Set `base_image=ubuntu/jammy` for Ubuntu 22.04, `ubuntu/noble` for 24.04, or `ubuntu/resolute` for 26.04.
 
 ## Custom Curtin Scripts
 If you need to override the default MaaS curtin scripts, create a custom role containing the curtin hooks. The files must be copied to the `/curtin` directory

docs/book/src/capi/providers/proxmox.md

@@ -38,6 +38,7 @@ the different operating systems.
 |--------------------|-----------------------------------------|
 | `ubuntu-2204.json` | The settings for the Ubuntu 22.04 image |
 | `ubuntu-2404.json` | The settings for the Ubuntu 24.04 image |
+| `ubuntu-2604.json` | The settings for the Ubuntu 26.04 image |
 
 The full list of available environment vars can be found in the `variables` section of `images/capi/packer/proxmox/packer.json`.
 

docs/book/src/capi/providers/scaleway.md

@@ -27,3 +27,4 @@ the different operating systems.
 | `rockylinux-9.json` | The settings for the Rocky Linux 9 image |
 | `ubuntu-2204.json`  | The settings for the Ubuntu 22.04 image  |
 | `ubuntu-2404.json`  | The settings for the Ubuntu 24.04 image  |
+| `ubuntu-2604.json`  | The settings for the Ubuntu 26.04 image  |

docs/book/src/capi/providers/vsphere.md

@@ -84,6 +84,8 @@ In addition to the configuration found in `images/capi/packer/config`, the `ova`
 | `ubuntu-2204-efi.json` | The settings for the Ubuntu 22.04 EFI image                      |
 | `ubuntu-2404.json` | The settings for the Ubuntu 24.04 image                      |
 | `ubuntu-2404-efi.json` | The settings for the Ubuntu 24.04 EFI image                      |
+| `ubuntu-2604.json` | The settings for the Ubuntu 26.04 image                      |
+| `ubuntu-2604-efi.json` | The settings for the Ubuntu 26.04 EFI image                      |
 | `vsphere.json`     | Additional settings needed when building on a remote vSphere |
 
 ### Photon specific options