Overhaul VirtFusion provider: 20 resources, 30 data sources, multipage pagination

Complete rewrite of the VirtFusion Terraform provider with full API coverage:

- 20 managed resources (server, build, SSH key, user, firewall, IP blocks, etc.)
- 30 data sources (hypervisors, packages, servers, IP blocks, self-service, etc.)
- New HTTP client with proper error handling, query parameter support, and
  automatic multipage pagination via GetAllPages (fetches all pages from
  Laravel-style paginated endpoints and merges into a single response)
- Fixed type mismatches against live API: ServerData.Suspended (int→bool),
  IPBlockData.Type (string→int), PackageData json tags (primaryStorage, etc.),
  ServerData nested CPU/Settings/Resources structure, HypervisorGroupResources
  array response
- Configurable results-per-page (default 300) on all list data sources
- Migrated CI from GitHub Actions to Gitea Actions
- Updated goreleaser config, go.mod dependencies, and examples

Verified against live VirtFusion instance at cp.vps.ezscale.tech:
all data sources return correct data with full pagination support.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

internal/provider/data_source_server_templates.go

@@ -0,0 +1,138 @@
+// Copyright (c) EZSCALE.
+// SPDX-License-Identifier: MPL-2.0
+
+package provider
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+
+	"terraform-provider-virtfusion/internal/client"
+
+	"github.com/hashicorp/terraform-plugin-framework/attr"
+	"github.com/hashicorp/terraform-plugin-framework/datasource"
+	"github.com/hashicorp/terraform-plugin-framework/datasource/schema"
+	"github.com/hashicorp/terraform-plugin-framework/types"
+)
+
+var _ datasource.DataSource = &ServerTemplatesDataSource{}
+var _ datasource.DataSourceWithConfigure = &ServerTemplatesDataSource{}
+
+// NewServerTemplatesDataSource returns a new data source for listing server templates.
+func NewServerTemplatesDataSource() datasource.DataSource {
+	return &ServerTemplatesDataSource{}
+}
+
+// ServerTemplatesDataSource defines the data source implementation.
+type ServerTemplatesDataSource struct {
+	client *client.Client
+}
+
+// ServerTemplatesDataSourceModel describes the data source data model.
+type ServerTemplatesDataSourceModel struct {
+	ServerID  types.Int64 `tfsdk:"server_id"`
+	Results   types.Int64 `tfsdk:"results"`
+	Templates types.List  `tfsdk:"templates"`
+}
+
+func (d *ServerTemplatesDataSource) Metadata(_ context.Context, req datasource.MetadataRequest, resp *datasource.MetadataResponse) {
+	resp.TypeName = req.ProviderTypeName + "_server_templates"
+}
+
+func (d *ServerTemplatesDataSource) Schema(_ context.Context, _ datasource.SchemaRequest, resp *datasource.SchemaResponse) {
+	resp.Schema = schema.Schema{
+		MarkdownDescription: "Use this data source to list available templates for a VirtFusion server.",
+		Attributes: map[string]schema.Attribute{
+			"server_id": schema.Int64Attribute{
+				MarkdownDescription: "The server ID to list templates for.",
+				Required:            true,
+			},
+			"results": resultsSchemaAttribute(),
+			"templates": schema.ListNestedAttribute{
+				MarkdownDescription: "The list of available templates.",
+				Computed:            true,
+				NestedObject: schema.NestedAttributeObject{
+					Attributes: map[string]schema.Attribute{
+						"id": schema.Int64Attribute{
+							MarkdownDescription: "The template ID.",
+							Computed:            true,
+						},
+						"name": schema.StringAttribute{
+							MarkdownDescription: "The template name.",
+							Computed:            true,
+						},
+					},
+				},
+			},
+		},
+	}
+}
+
+func (d *ServerTemplatesDataSource) Configure(_ context.Context, req datasource.ConfigureRequest, resp *datasource.ConfigureResponse) {
+	if req.ProviderData == nil {
+		return
+	}
+
+	c, ok := req.ProviderData.(*client.Client)
+	if !ok {
+		resp.Diagnostics.AddError(
+			"Unexpected Data Source Configure Type",
+			fmt.Sprintf("Expected *client.Client, got: %T. Please report this issue to the provider developers.", req.ProviderData),
+		)
+		return
+	}
+
+	d.client = c
+}
+
+func (d *ServerTemplatesDataSource) Read(ctx context.Context, req datasource.ReadRequest, resp *datasource.ReadResponse) {
+	var data ServerTemplatesDataSourceModel
+	resp.Diagnostics.Append(req.Config.Get(ctx, &data)...)
+	if resp.Diagnostics.HasError() {
+		return
+	}
+
+	result, err := d.client.GetAllPages(ctx, fmt.Sprintf("/servers/%d/templates?%s", data.ServerID.ValueInt64(), resultsQueryParam(data.Results)))
+	if err != nil {
+		resp.Diagnostics.AddError("Error Reading Server Templates", err.Error())
+		return
+	}
+
+	var templateResp client.TemplateResponse
+	if err := json.Unmarshal(result, &templateResp); err != nil {
+		resp.Diagnostics.AddError("Error Parsing Server Templates Response", err.Error())
+		return
+	}
+
+	templateAttrTypes := map[string]attr.Type{
+		"id":   types.Int64Type,
+		"name": types.StringType,
+	}
+
+	templateObjects := make([]attr.Value, len(templateResp.Data))
+	for i, t := range templateResp.Data {
+		obj, diags := types.ObjectValue(
+			templateAttrTypes,
+			map[string]attr.Value{
+				"id":   types.Int64Value(t.ID),
+				"name": types.StringValue(t.Name),
+			},
+		)
+		resp.Diagnostics.Append(diags...)
+		if resp.Diagnostics.HasError() {
+			return
+		}
+		templateObjects[i] = obj
+	}
+
+	templatesList, diags := types.ListValue(types.ObjectType{AttrTypes: templateAttrTypes}, templateObjects)
+	resp.Diagnostics.Append(diags...)
+	if resp.Diagnostics.HasError() {
+		return
+	}
+
+	data.Templates = templatesList
+
+	resp.Diagnostics.Append(resp.State.Set(ctx, &data)...)
+}