Enable QEMU guest agent on Proxmox VMs; register lxc-gui sops key

create-proxmox-resource.sh's `qm create` never passed --agent, so despite
services.qemuGuest.enable = true being set on every host, Proxmox never
created the virtio-serial channel the guest agent needs -- qm guest exec
and the UI's IP-address display silently never worked for any VM this
script created. Found while live-testing every lxc-*/proxmox-* build type
against pve.sweet.home for an end-to-end flake audit.

Also registers a fresh sops age key for lxc-gui (no prior registration
existed), generated while testing that target live -- needed before
lxc-gui can be deployed with working secrets.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CZHwwAM7cacQKkqKfQ5e8a

.sops.yaml

@@ -9,6 +9,7 @@ keys:
   - &lxc-docker age1ezk9x53zt8kcnscdm80jcyf0xq97vndv7jsn3rl8cc0cwm2jmpmq372dzs
   - &lxc-minimal age1jy444f9d9stygj4p3w9kh54cqcfr654tvr75tdvee5cxsgtdtc9q3v60ep
   - &lxc-pxe-boot age1fxxzpnfse8nd9wz78ht3m0plrmraacf4cpga0pe8fm2tdnqcgy8q7qsyvp
+  - &lxc-gui age190htw7prp4vln076dxjx3gxxaq06h0zl0te7cqgpx79vl3lhkaes8suy05
 
 creation_rules:
   # Shared across every currently-deployed host: root/nixos password hash,
@@ -28,6 +29,7 @@ creation_rules:
           - *proxmox-minimal
           - *lxc-docker
           - *lxc-pxe-boot
+          - *lxc-gui
 
   - path_regex: secrets/nix-cache\.yaml$
     key_groups:

scripts/proxmox/create-proxmox-resource.sh

@@ -797,9 +797,15 @@ else
   echo "==> Creating VM ${vmid} (${name})..."
   # pre-enrolled-keys=0 disables OVMF's Secure Boot key pre-enrollment --
   # required, or systemd-boot (unsigned) can't be trusted by the firmware.
+  # --agent 1: wires up the virtio-serial channel QEMU exposes to the guest.
+  # modules/common/configuration.nix sets services.qemuGuest.enable = true
+  # on every host, so the guest-side qemu-ga daemon is already running --
+  # without this flag Proxmox never creates the channel it listens on, so
+  # `qm guest exec`/`qm agent` and the UI's IP-address display silently
+  # never work for any VM this script creates.
   remote "qm create ${vmid} --name ${name} --memory ${memory} --cores ${cores} \
 --net0 virtio,bridge=${bridge} --bios ovmf --machine q35 --scsihw virtio-scsi-pci \
---efidisk0 ${storage}:1,efitype=4m,pre-enrolled-keys=0"
+--efidisk0 ${storage}:1,efitype=4m,pre-enrolled-keys=0 --agent enabled=1"
 
   if [[ "$dry_run" -eq 1 ]]; then
     echo "[dry-run] ssh ${ssh_target} -- qm importdisk ${vmid} ${remote_path} ${storage}"

secrets/common.yaml

@@ -5,94 +5,103 @@ sops:
     age:
         - enc: |
             -----BEGIN AGE ENCRYPTED FILE-----
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+            enZI5SV1F86HOTEhK0QbnEW3jMl4ZXOtAlwcys2oE9a783MSgVPxeg==
             -----END AGE ENCRYPTED FILE-----
           recipient: age1njap586hc0q43kr03g6c8eqhdsmk8zcafkl3f83xwlc2gqhlmfgs4tmwad
         - enc: |
             -----BEGIN AGE ENCRYPTED FILE-----
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             -----END AGE ENCRYPTED FILE-----
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         - enc: |
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             -----END AGE ENCRYPTED FILE-----
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         - enc: |
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             -----END AGE ENCRYPTED FILE-----
           recipient: age1jy444f9d9stygj4p3w9kh54cqcfr654tvr75tdvee5cxsgtdtc9q3v60ep
         - enc: |
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           recipient: age120whqj96g26lsgy4udvgsn8dc9lumh8jeu3a564fx79rjr5lxffqmrljuu
         - enc: |
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           recipient: age1xjst4frdh0th6q8m7p7u9g5af7ty5jqeum0p6z8a52a9q7st7ewqw8yl9j
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     lastmodified: "2026-07-19T02:30:40Z"
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