go.mod: update github.com/containers/image/v5

Version 5.22 introduced a new option to /etc/containers/policy.json called
keyPaths, see

https://github.com/containers/image/pull/1609

EL9 immediately took advantage of this new feature and started using it, see
04645c4a84

This quickly became an issue in our code: The go library (containers/image)
parses the configuration file very strictly and refuses to create a client
when policy.json with an unknown key is present on the filesystem. As we
used 5.21.1 that doesn't know the new key, our unit tests started to
failing when containers-common was present.

Reproducer:
podman run --pull=always --rm -it centos:stream9
dnf install -y dnf-plugins-core
dnf config-manager --set-enabled crb
dnf install -y gpgme-devel libassuan-devel krb5-devel golang git-core
git clone https://github.com/osbuild/osbuild-composer
cd osbuild-composer

# install the new containers-common and run the test
dnf install -y https://kojihub.stream.centos.org/kojifiles/packages/containers-common/1/44.el9/x86_64/containers-common-1-44.el9.x86_64.rpm
go test -count 1 ./...

# this returns:
--- FAIL: TestClientResolve (0.00s)
    client_test.go:31:
        	Error Trace:	client_test.go:31
        	Error:      	Received unexpected error:
        	            	Unknown key "keyPaths"
        	            	invalid policy in "/etc/containers/policy.json"
        	            	github.com/containers/image/v5/signature.NewPolicyFromFile
        	            		/osbuild-composer/vendor/github.com/containers/image/v5/signature/policy_config.go:88
        	            	github.com/osbuild/osbuild-composer/internal/container.NewClient
        	            		/osbuild-composer/internal/container/client.go:123
        	            	github.com/osbuild/osbuild-composer/internal/container_test.TestClientResolve
        	            		/osbuild-composer/internal/container/client_test.go:29
        	            	testing.tRunner
        	            		/usr/lib/golang/src/testing/testing.go:1439
        	            	runtime.goexit
        	            		/usr/lib/golang/src/runtime/asm_amd64.s:1571
        	Test:       	TestClientResolve
    client_test.go:32:
        	Error Trace:	client_test.go:32
        	Error:      	Expected value not to be nil.
        	Test:       	TestClientResolve

 When run with an older containers-common, it succeeds:
 dnf install -y https://kojihub.stream.centos.org/kojifiles/packages/containers-common/1/40.el9/x86_64/containers-common-1-40.el9.x86_64.rpm
 go test -count 1 ./...
 PASS

To sum it up, I had to upgrade github.com/containers/image/v5 to v5.22.0.
Unfortunately, this wasn't so simple, see

go get github.com/containers/image/v5@latest
go: github.com/containers/image/v5@v5.22.0 requires
	github.com/letsencrypt/boulder@v0.0.0-20220331220046-b23ab962616e requires
	github.com/honeycombio/beeline-go@v1.1.1 requires
	github.com/gobuffalo/pop/v5@v5.3.1 requires
	github.com/mattn/go-sqlite3@v2.0.3+incompatible: reading github.com/mattn/go-sqlite3/go.mod at revision v2.0.3: unknown revision v2.0.3

It turns out that github.com/mattn/go-sqlite3@v2.0.3+incompatible has been
recently retracted https://github.com/mattn/go-sqlite3/pull/998 and this
broke a ton of packages depending on it. I was able to fix it by adding

exclude github.com/mattn/go-sqlite3 v2.0.3+incompatible

to our go.mod, see
https://github.com/mattn/go-sqlite3/issues/975#issuecomment-955661657

After adding it,
go get github.com/containers/image/v5@latest
succeeded and tools/prepare-source.sh took care of the rest.

Signed-off-by: Ondřej Budai <ondrej@budai.cz>

vendor/github.com/letsencrypt/boulder/goodkey/blocked.go

@@ -0,0 +1,98 @@
+package goodkey
+
+import (
+	"crypto"
+	"crypto/sha256"
+	"encoding/base64"
+	"encoding/hex"
+	"errors"
+	"io/ioutil"
+
+	"github.com/letsencrypt/boulder/core"
+
+	yaml "gopkg.in/yaml.v2"
+)
+
+// blockedKeys is a type for maintaining a map of SHA256 hashes
+// of SubjectPublicKeyInfo's that should be considered blocked.
+// blockedKeys are created by using loadBlockedKeysList.
+type blockedKeys map[core.Sha256Digest]bool
+
+var ErrWrongDecodedSize = errors.New("not enough bytes decoded for sha256 hash")
+
+// blocked checks if the given public key is considered administratively
+// blocked based on a SHA256 hash of the SubjectPublicKeyInfo.
+// Important: blocked should not be called except on a blockedKeys instance
+// returned from loadBlockedKeysList.
+// function should not be used until after `loadBlockedKeysList` has returned.
+func (b blockedKeys) blocked(key crypto.PublicKey) (bool, error) {
+	hash, err := core.KeyDigest(key)
+	if err != nil {
+		// the bool result should be ignored when err is != nil but to be on the
+		// paranoid side return true anyway so that a key we can't compute the
+		// digest for will always be blocked even if a caller foolishly discards the
+		// err result.
+		return true, err
+	}
+	return b[hash], nil
+}
+
+// loadBlockedKeysList creates a blockedKeys object that can be used to check if
+// a key is blocked. It creates a lookup map from a list of
+// SHA256 hashes of SubjectPublicKeyInfo's in the input YAML file
+// with the expected format:
+//
+// ```
+// blocked:
+//   - cuwGhNNI6nfob5aqY90e7BleU6l7rfxku4X3UTJ3Z7M=
+//   <snipped>
+//   - Qebc1V3SkX3izkYRGNJilm9Bcuvf0oox4U2Rn+b4JOE=
+// ```
+//
+// If no hashes are found in the input YAML an error is returned.
+func loadBlockedKeysList(filename string) (*blockedKeys, error) {
+	yamlBytes, err := ioutil.ReadFile(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	var list struct {
+		BlockedHashes    []string `yaml:"blocked"`
+		BlockedHashesHex []string `yaml:"blockedHashesHex"`
+	}
+	err = yaml.Unmarshal(yamlBytes, &list)
+	if err != nil {
+		return nil, err
+	}
+
+	if len(list.BlockedHashes) == 0 && len(list.BlockedHashesHex) == 0 {
+		return nil, errors.New("no blocked hashes in YAML")
+	}
+
+	blockedKeys := make(blockedKeys, len(list.BlockedHashes)+len(list.BlockedHashesHex))
+	for _, b64Hash := range list.BlockedHashes {
+		decoded, err := base64.StdEncoding.DecodeString(b64Hash)
+		if err != nil {
+			return nil, err
+		}
+		if len(decoded) != sha256.Size {
+			return nil, ErrWrongDecodedSize
+		}
+		var sha256Digest core.Sha256Digest
+		copy(sha256Digest[:], decoded[0:sha256.Size])
+		blockedKeys[sha256Digest] = true
+	}
+	for _, hexHash := range list.BlockedHashesHex {
+		decoded, err := hex.DecodeString(hexHash)
+		if err != nil {
+			return nil, err
+		}
+		if len(decoded) != sha256.Size {
+			return nil, ErrWrongDecodedSize
+		}
+		var sha256Digest core.Sha256Digest
+		copy(sha256Digest[:], decoded[0:sha256.Size])
+		blockedKeys[sha256Digest] = true
+	}
+	return &blockedKeys, nil
+}