feat: password reset (#179) (#186)

* feat: password reset via symfonycasts/reset-password-bundle (#179)

Implements the full password reset flow using the SymfonyCasts reset-password-bundle.

* ci: share base layer cache between dev and prod builds

* fix: use CSS form selector in tests instead of translated button text

* fix: translate missing validator string for reset password email field

* fix: translate reset password form labels via TranslatorInterface

* ci: override MAILER_DSN to null for PHPUnit so mailer host is not required

templates/reset_password/email.html.twig

@@ -0,0 +1,9 @@
+<h1>Hi!</h1>
+
+<p>To reset your password, please visit the following link</p>
+
+<a href="{{ url('tvdt_reset_password', {token: resetToken.token}) }}">{{ url('tvdt_reset_password', {token: resetToken.token}) }}</a>
+
+<p>This link will expire in {{ resetToken.expirationMessageKey|trans(resetToken.expirationMessageData, 'ResetPasswordBundle') }}.</p>
+
+<p>Cheers!</p>