fix(keycloak): Migrate theme to gitea

bootstrap/keycloak-theme/Dockerfile

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+FROM busybox
+
+COPY keycloak-themes/oceanbox /theme

bootstrap/keycloak-theme/keycloak-themes/oceanbox/login/resources/css/login.css

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+:root {
+    --keycloak-logo-url: url('../img/keycloak-logo-text.png');
+    --keycloak-logo-height: 63px;
+    --keycloak-logo-width: 300px;
+}
+
+.pf-v5-c-login__container {
+    grid-template-columns: 34rem;
+    grid-template-areas: "header"
+                         "main"
+}
+
+.login-pf body {
+    background: url("../img/oceanbox-bg.png") no-repeat center center fixed;
+    background-size: cover;
+    height: 100%;
+}
+
+div.kc-logo-text {
+    background-image: var(--keycloak-logo-url);
+    height: var(--keycloak-logo-height);
+    width: var(--keycloak-logo-width);
+    background-repeat: no-repeat;
+    background-size: contain;
+    margin: 0 auto;
+}
+
+div.kc-logo-text span {
+    display: none;
+}
+
+#kc-recovery-codes-list {
+    columns: 2;
+}
+
+#certificate_subjectDN {
+    overflow-wrap: break-word
+}
+
+#kc-header-wrapper {
+    font-size: 29px;
+    text-transform: uppercase;
+    letter-spacing: 3px;
+    line-height: 1.2em;
+    white-space: normal;
+    color: var(--pf-v5-global--Color--light-100) !important;
+    text-align: center;
+}
+
+hr {
+    margin-top: var(--pf-v5-global--spacer--sm);
+    margin-bottom: var(--pf-v5-global--spacer--md);
+}
+
+@media (min-width: 768px) {
+    div.pf-v5-c-login__main-header {
+        grid-template-columns: 70% 30%;
+    }
+}

bootstrap/keycloak-theme/keycloak-themes/oceanbox/login/theme.properties

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+parent=keycloak.v2
+
+styles=css/login.css