nixos: Add working container VM (w/ vaultwarden)

Also improve IPv6 addressing / routing

secrets/user-passwd.txt.age

@@ -1,15 +1,16 @@
 age-encryption.org/v1
--> ssh-ed25519 SKXJUw HNKr/VHMm2Tm3zXJy/hiWFT/HwMrs5dzi+JSdfe/3wE
-NH/28Nkeij6o3h63Fu/h2dgI8b6spZ0dMKp/yUfTCq4
--> ssh-ed25519 B9K/XQ it45NurDEjYL5dAVJsJmi+MlIHKSpP2Lj7Fij5/ziUs
-1vKMO+h6aMAWDQDWwKrT0PwDhw90mk7x7uf27CCz27s
--> ssh-ed25519 LLxJog aAmssC1kqweHP1TEtkVurusq1AqIc8t7HZ7A7hjRtAw
-lDbexbeib25DPuFiObs+1PQgu1WPG8a/P01QD6tO1f8
--> X25519 lcKREBQdELTzOpxRXMJa5J9stI9u3tZJdAHGW2LC8W4
-7c+kF11czGa7DEq3+ZJW+iSLcU/XKn+YJlciQzLwP64
--> y251}dI-grease
-zIIT0zZ1oHhvxwQtUM6JsvhIqbQ0fRz5YFJMrxkwk8FDwgIyoKHQhVWNYmFDWhEs
-K0QD0scV1HUGGAJdMoePqHw
---- a2PYkwWrS0NFhoL/0IgmuvKRjkORQrotG+RKXVtXeiI
-t<>6<EFBFBD><36>!<21>,ޟo.<2E>n<EFBFBD>7J<02><>K`<60><1D>a<EFBFBD>i.<05><>c<EFBFBD>>$<>W<EFBFBD><57>>"8<03><><r4Y'{<7B><><EFBFBD>O"B<><42><EFBFBD><06>yg
-P&<26>
+-> ssh-ed25519 SKXJUw WuE37itEkLwXXidFy5KSirx2nHJrMSv2s1QtdWX8SFQ
++hQkpae7pD8CddccW/EkXdM9PwLvR9ExhfiMSpDrmR4
+-> ssh-ed25519 B9K/XQ dcFFZZW7YmoIE9t4f5q75Fiydok4dlFvMhUe4AL0glo
+VNmnLMMyPMmeaRS9TCve0jFLoOsMOjFinERzbCYb5VU
+-> ssh-ed25519 b6YMqg rzXuWZ70pstFv91Pc9rEzX6zQoP7EzFbaVqLztzeDEg
+FfdsqfWrWhVp69Y06kMdJLki4SZcsTfQgpGkOV8OEWY
+-> ssh-ed25519 Lqn0Yw w34t0WrHrI0X9YPiKuqtA/g4nb5u+MUR5IMhxax94GA
+om8lmlCa7b5dFTHgTWkfG0JQlo7SGuOsMKWV+ZyZODo
+-> X25519 /D+YDNaHuzjd1qfUVGSzMv/Gme3c7EfnAReZwijNrHU
+Mq8c561BFjPNpevYYxZoQlXyukWoJ/FqHMygRVIa8L4
+-> K#M-grease
+cqBqOMKVvx0kDafiKK3izbQO2jJWDt0cw1z7iIlO2HQcDyrymtIkwiUcZ0DnjCO8
+0GP/yJXOxwzP/L7+
+--- 9euRtnfRLtKp2uI4YFGFJNNIvn8+YtQ8Ugoki23oSAQ
+<EFBFBD>

secrets/vaultwarden.env.age

@@ -1,10 +1,9 @@
 age-encryption.org/v1
--> ssh-ed25519 LLxJog eSRhmFeLs7fG7lPZ44XaMw1j98q/P9LQt/5Memro+EU
-Z5TWxKcZVYJhM6K7cxJV+zUjkYiHb6l2pLx+yCYU2/8
--> X25519 YKwo3Qc5evINbdfZwikjAX0xX1tVmzdcHKD3S26u6WE
-apofL5khdAzIXR/8EQhbOK8wyR/XC9xRjPb4D+yvNpU
--> {|n)k`|=-grease
-9UNdvH8XaUfMKexmVOSLAFqX3hrNvcn76wlY49E5RE247+gMRINSSt6iFqoCQLFi
-utHb9c5Rkp813qlNmqJVCX2Ye9VLLMi4Zw
---- 4JWdZtLMWoV8ALYYT/WNBgZhjToxibIVWZhWDUn9Zjw
-<12><>
2<>ο(dW<64><57>b<EFBFBD><62><EFBFBD><EFBFBD><EFBFBD>*<05><02><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>}<7D>ĐT<C490>6<EFBFBD>ךi<17>W<EFBFBD><57>S<EFBFBD>R<EFBFBD><52><EFBFBD>vbd<62>Lwh3<68><33>i<14><>vV?صc<D8B5>#<23><><EFBFBD>sbK<62>(pR"I<10><><05>d<EFBFBD><64><EFBFBD>E9<45><39>M
+-> ssh-ed25519 Lqn0Yw VmwYgZn0wfCPNmwMot88E5HIt5KQDOQI6ylzQ5WJeg0
+qxaprd2nOEmNjq5uMfN/SG3VYOANsl1mgB0o/7T+2Ek
+-> X25519 8JIr+LQxrTRS4E9EyLFKSB/0J207foeHRDhWjLVOZEw
+evAK6VTgfMucDrQL2zRu4CI52gIK/TNXH2Tx0iYEMVM
+-> <"8l}KO-grease
+Rd7ooeg76wEs9x+a5HhTFlS5Y+RK7wZK1SUdI4SknztHMjMwO/FC/w
+--- 7c/+kShXCtzYStmGvEF/XzrLiE/LpSHX4g1whtZEBYk
+<EFBFBD>~O,<2C><>4<><34>H&b<>9]-<2D>SK<>-<2D><><EFBFBD><EFBFBD>l<EFBFBD><6C><EFBFBD>^<5E><><EFBFBD><EFBFBD>DJ<44><1D>6a<36><61>Â-<2D>ɠ)<29>	<09><>X<EFBFBD>:N<11><><EFBFBD><EFBFBD>Ԭ<EFBFBD>#<23><><EFBFBD>~<1E><>&<26>i{<7B><><EFBFBD><EFBFBD>pU+Ϸ<>U<EFBFBD><55>w>b<><62><EFBFBD>:N/R