Fix jitsi ghcr.io registry, fix keila tz writable volume

- jitsi: stable tags moved to ghcr.io/jitsi/* (no longer on Docker Hub)
- keila: mount emptyDir at /opt/app/lib/tz-0.28.2/priv so the tz
  library can write timezone data (TZ_AUTOUPDATE env var doesn't work,
  it's Elixir app config not env-driven)

keila/versions/0/deployment.yaml

@@ -58,8 +58,6 @@ spec:
               key: smtpPassword
         - name: MAILER_SMTP_FROM_EMAIL
           value: "{{ .smtp.from }}"
-        - name: TZ_AUTOUPDATE
-          value: "disabled"
         - name: DISABLE_REGISTRATION
           value: "{{ .disableRegistration }}"
         - name: KEILA_USER
@@ -74,6 +72,8 @@ spec:
         volumeMounts:
         - name: uploads
           mountPath: /var/lib/keila/uploads
+        - name: tz-data
+          mountPath: /opt/app/lib/tz-0.28.2/priv
         securityContext:
           allowPrivilegeEscalation: false
           capabilities:
@@ -94,4 +94,6 @@ spec:
       volumes:
       - name: uploads
         persistentVolumeClaim:
-          claimName: keila-uploads
+          claimName: keila-uploads
+      - name: tz-data
+        emptyDir: {}