Release 0.7.5 (#70)

* Resolve issue with opaque tokens not being parsed correctly

* Increase test coverage

* Further improvements to test coverage and code quality

* Add new providers.

* fixup! Add new providers.

* Cleanup.

* fixup! Cleanup.

* fixup! fixup! Cleanup.

* fixup! fixup! fixup! Cleanup.

* fixup! fixup! fixup! fixup! Cleanup.

* Memory management optimisation

24 bytes per Put < 256-4096 bytes per buffer allocation avoided (10-170x difference)

* Pooling cleanup.

internal/providers/github.go

@@ -0,0 +1,61 @@
+package providers
+
+import (
+	"net/url"
+)
+
+// GitHubProvider encapsulates GitHub-specific OIDC logic.
+type GitHubProvider struct {
+	*BaseProvider
+}
+
+// NewGitHubProvider creates a new instance of the GitHubProvider.
+func NewGitHubProvider() *GitHubProvider {
+	return &GitHubProvider{
+		BaseProvider: NewBaseProvider(),
+	}
+}
+
+// GetType returns the provider's type.
+func (p *GitHubProvider) GetType() ProviderType {
+	return ProviderTypeGitHub
+}
+
+// GetCapabilities returns the specific capabilities of the GitHub provider.
+// WARNING: GitHub does NOT support OpenID Connect - it's OAuth 2.0 only.
+// This provider should only be used for OAuth flows, not OIDC authentication.
+func (p *GitHubProvider) GetCapabilities() ProviderCapabilities {
+	return ProviderCapabilities{
+		SupportsRefreshTokens:      false, // GitHub OAuth apps don't support refresh tokens
+		RequiresOfflineAccessScope: false, // GitHub doesn't use offline_access
+		RequiresPromptConsent:      false,
+		PreferredTokenValidation:   "access", // GitHub only provides access tokens, no ID tokens
+	}
+}
+
+// BuildAuthParams configures GitHub-specific authentication parameters.
+func (p *GitHubProvider) BuildAuthParams(baseParams url.Values, scopes []string) (*AuthParams, error) {
+	// GitHub doesn't use offline_access scope, so remove it if present
+	var filteredScopes []string
+	for _, scope := range scopes {
+		if scope != "offline_access" {
+			filteredScopes = append(filteredScopes, scope)
+		}
+	}
+
+	// If no scopes specified, use default GitHub scopes for OAuth
+	// Note: GitHub doesn't support 'openid' scope as it's not an OIDC provider
+	if len(filteredScopes) == 0 {
+		filteredScopes = []string{"user:email", "read:user"}
+	}
+
+	return &AuthParams{
+		URLValues: baseParams,
+		Scopes:    deduplicateScopes(filteredScopes),
+	}, nil
+}
+
+// GitHub requires specific configuration for proper operation.
+func (p *GitHubProvider) ValidateConfig() error {
+	return p.BaseProvider.ValidateConfig()
+}