chore: Pin charm base to 24.04 in Terraform module and release-charm action (#302)

Ref: canonical/bundle-kubeflow#1347

This PR is a backport of #301. Note that we're also pinning the version
of the `juju` Terraform provider due to
canonical/bundle-kubeflow#1353

Author: mvlassis

.github/workflows/release.yaml

@@ -28,4 +28,5 @@ jobs:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           destination-channel: ${{ github.event.inputs.destination-channel }}
           origin-channel: ${{ github.event.inputs.origin-channel }}
+          base-channel: "24.04"
           base-channel: ${{ github.event.inputs.base-image-channel }}

terraform/README.md

@@ -13,7 +13,7 @@ The module offers the following configurable inputs:
 | Name | Type | Description | Required |
 | - | - | - | - |
 | `app_name`| string | Application name | False |
-| `base`| string | Application base | False |
+| `base`| string | Charm base | False |
 | `channel`| string | Channel that the charm is deployed from | False |
 | `config`| map(string) | Map of the charm configuration options | False |
 | `model_name`| string | Name of the model that the charm is deployed on | True |

terraform/variables.tf

@@ -5,7 +5,7 @@ variable "app_name" {
 }
 
 variable "base" {
-  description = "Application base"
+  description = "Charm base"
   type        = string
   default     = "ubuntu@24.04"
 }

terraform/versions.tf

@@ -3,7 +3,7 @@ terraform {
   required_providers {
     juju = {
       source  = "juju/juju"
-      version = ">= 0.14.0"
+      version = ">= 0.14.0, < 1.0.0"
     }
   }
 }