terraform: Azure Marketplace image support (#2651)

* terraform: add Azure marketplace variable

Signed-off-by: Moritz Sanft <58110325+msanft@users.noreply.github.com>

* config: add Azure marketplace variable

Signed-off-by: Moritz Sanft <58110325+msanft@users.noreply.github.com>

* cli: use Terraform variables from config

Signed-off-by: Moritz Sanft <58110325+msanft@users.noreply.github.com>

* terraform: pass down marketplace variable

* image: pad Azure images to 1GiB

* terraform: add version attribute to marketplace image

* semver: allow versions to be exported without prefix

* cli: boolean var to use marketplace images

* config: remove dive key

* dev-docs: add instructions on how to use marketplace images

* terraform: fix unit test

* terraform: only fetch image for non-marketplace images

* mpimage: refactor image selection

Signed-off-by: Moritz Sanft <58110325+msanft@users.noreply.github.com>

* [remove] increase minor version for image build

Signed-off-by: Moritz Sanft <58110325+msanft@users.noreply.github.com>

* terraform: ignore changes to source_image_reference on upgrade

* operator: add support for parsing Azure marketplace images

Signed-off-by: Moritz Sanft <58110325+msanft@users.noreply.github.com>

* upgrade: fix imagefetcher call

* docs: add info about azure marketplace

* image: ensure more than 1GiB in size

* image: test to pad to 2GiB

* version: change back to v2.14.0-pre

* image: GPT-conformant image size padding

* [remove] increase version

* mpimage: inline prefix func

Signed-off-by: Moritz Sanft <58110325+msanft@users.noreply.github.com>

* ci: add marketplace image e2e test

Signed-off-by: Moritz Sanft <58110325+msanft@users.noreply.github.com>

* [remove] register workflow

* ci: fix workflow name

* ci: only allow azure test

* cli: add marketplace image input to interface

* cli: fix argument passing

* version: roll back to v2.14.0

* ci: add force-flag support

* Update docs/docs/overview/license.md

* Update dev-docs/workflows/marketplace-images.md

Co-authored-by: Moritz Eckert <m1gh7ym0@gmail.com>

---------

Signed-off-by: Moritz Sanft <58110325+msanft@users.noreply.github.com>
Co-authored-by: Moritz Eckert <m1gh7ym0@gmail.com>
Co-authored-by: Thomas Tendyck <51411342+thomasten@users.noreply.github.com>

internal/mpimage/uri.go

@@ -0,0 +1,80 @@
+/*
+Copyright (c) Edgeless Systems GmbH
+
+SPDX-License-Identifier: AGPL-3.0-only
+*/
+
+package mpimage
+
+import (
+	"fmt"
+	"net/url"
+	"strings"
+
+	"github.com/edgelesssys/constellation/v2/internal/cloud/cloudprovider"
+	"github.com/edgelesssys/constellation/v2/internal/constants"
+	"github.com/edgelesssys/constellation/v2/internal/semver"
+)
+
+// MarketplaceImage represents a CSP-agnostic marketplace image.
+type MarketplaceImage interface {
+	URI() string
+}
+
+// NewFromURI returns a new MarketplaceImage for the given image URI.
+func NewFromURI(uri string) (MarketplaceImage, error) {
+	u, err := url.Parse(uri)
+	if err != nil {
+		return nil, err
+	}
+
+	if u.Scheme != constants.MarketplaceImageURIScheme {
+		return nil, fmt.Errorf("invalid scheme: %s", u.Scheme)
+	}
+
+	switch u.Host {
+	case cloudprovider.Azure.String():
+		ver, err := semver.New(u.Query().Get(constants.AzureMarketplaceImageVersionKey))
+		if err != nil {
+			return nil, fmt.Errorf("invalid image version: %w", err)
+		}
+		return NewAzureMarketplaceImage(ver), nil
+	default:
+		return nil, fmt.Errorf("invalid host: %s", u.Host)
+	}
+}
+
+// AzureMarketplaceImage represents an Azure marketplace image.
+type AzureMarketplaceImage struct {
+	Publisher string
+	Offer     string
+	SKU       string
+	Version   string
+}
+
+// NewAzureMarketplaceImage returns a new Constellation marketplace image for the given version.
+func NewAzureMarketplaceImage(version semver.Semver) AzureMarketplaceImage {
+	return AzureMarketplaceImage{
+		Publisher: constants.AzureMarketplaceImagePublisher,
+		Offer:     constants.AzureMarketplaceImageOffer,
+		SKU:       constants.AzureMarketplaceImagePlan,
+		Version:   strings.TrimPrefix(version.String(), "v"), // Azure requires X.Y.Z format
+	}
+}
+
+// URI returns the URI for the image.
+func (i AzureMarketplaceImage) URI() string {
+	u := &url.URL{
+		Scheme: constants.MarketplaceImageURIScheme,
+		Host:   cloudprovider.Azure.String(),
+	}
+
+	q := u.Query()
+	q.Set(constants.AzureMarketplaceImagePublisherKey, i.Publisher)
+	q.Set(constants.AzureMarketplaceImageOfferKey, i.Offer)
+	q.Set(constants.AzureMarketplaceImageSkuKey, i.SKU)
+	q.Set(constants.AzureMarketplaceImageVersionKey, i.Version)
+	u.RawQuery = q.Encode()
+
+	return u.String()
+}