fix(org): make the organisation parameter optional

this will allow to pass the parameter as an environment variable

pkg/provider/impl/provider_configure.go

@@ -26,6 +26,10 @@ func (p *Provider) Configure(ctx context.Context, req provider.ConfigureRequest,
 	} else {
 		p.organization = config.Organisation.ValueString()
 	}
+	if p.organization == "" {
+		resp.Diagnostics.AddError("Invalid provider configuration", "Organisation should be set by either the organisation parameter or by the CC_ORGANISATION environment variable")
+		return
+	}
 
 	// Allow to get creds from CLI config directory or by injected variables
 	if config.Secret.IsUnknown() ||

pkg/provider/impl/provider_schema.go

@@ -44,7 +44,7 @@ func (p *Provider) Schema(_ context.Context, req provider.SchemaRequest, res *pr
 			},
 			"organisation": schema.StringAttribute{
 				Sensitive:           true,
-				Required:            true,
+				Optional:            true, // can be read from environment variable
 				MarkdownDescription: "CleverCloud organisation, can be either orga_xxx, or user_xxx for personal spaces. This parameter can also be provided via CC_ORGANISATION environment variable.",
 				Validators: []validator.String{
 					pkg.NewValidatorRegex("valid owner name", regexp.MustCompile(`^(user|orga)_.{36}`)),