Remove temporary Netbird connectivity debug step

The deploy pipeline works end-to-end now (Gimli deploys successfully),
so the diagnostic step used to trace the WireGuard/TUN issue is no
longer needed. RPIC continue-on-error is kept until the cluster returns.

.github/workflows/build-docker-images.yml

@@ -56,70 +56,6 @@ jobs:
     needs: build
 
     steps:
-      - name: Debug Netbird connectivity
-        env:
-          NB_URL: ${{ secrets.NETBIRD_URL }}
-          NB_KEY: ${{ secrets.NETBIRD_SETUP_KEY }}
-        run: |
-          echo "=== Secret presence (values are masked) ==="
-          echo "NETBIRD_URL length: ${#NB_URL}"
-          echo "NETBIRD_SETUP_KEY length: ${#NB_KEY}"
-          if [ -z "$NB_URL" ]; then echo "WARNING: NETBIRD_URL is EMPTY"; fi
-          if [ -z "$NB_KEY" ]; then echo "WARNING: NETBIRD_SETUP_KEY is EMPTY"; fi
-
-          # Derive host from the URL without printing the full URL.
-          host="$(printf '%s' "$NB_URL" | sed -E 's#^[a-zA-Z]+://##; s#[:/].*$##')"
-          echo "Derived management host: ${host:-<none>}"
-
-          echo "=== DNS resolution ==="
-          getent hosts "$host" || nslookup "$host" || echo "DNS resolution FAILED for $host"
-
-          echo "=== Control plane: HTTPS :443 reachable? ==="
-          curl -sS -o /dev/null -w "HTTP %{http_code}  connect=%{time_connect}s\n" \
-            --max-time 15 "https://${host}/" || echo "curl to :443 FAILED"
-
-          # Other Netbird peers connect fine, so the server + 51820/udp are OK.
-          # 'netbird up' still hangs on THIS runner, which points to the runner
-          # container being unable to create the WireGuard tunnel interface.
-          # WireGuard needs a TUN device + NET_ADMIN capability inside the
-          # container; runner containers often lack these.
-
-          echo "=== Runner: TUN device present? (/dev/net/tun) ==="
-          if [ -c /dev/net/tun ]; then
-            echo "/dev/net/tun EXISTS (char device)"
-          else
-            echo "/dev/net/tun MISSING -- WireGuard cannot create a tunnel (LIKELY CAUSE)"
-          fi
-
-          echo "=== Runner: effective capabilities (need NET_ADMIN) ==="
-          if command -v capsh >/dev/null 2>&1; then
-            capsh --print 2>/dev/null | grep -i 'Current:' || true
-          else
-            grep -i CapEff /proc/self/status || true
-            echo "(decode with: capsh --decode=<hex>; NET_ADMIN is bit 12 / 0x1000)"
-          fi
-
-          echo "=== Runner: WireGuard tooling / kernel module ==="
-          command -v wg >/dev/null 2>&1 && echo "wg present" || echo "wg NOT present"
-          command -v wireguard-go >/dev/null 2>&1 && echo "wireguard-go (userspace) present" || echo "wireguard-go NOT present"
-          (lsmod 2>/dev/null | grep -q wireguard && echo "kernel wireguard module loaded") || echo "kernel wireguard module NOT loaded (userspace fallback needed)"
-
-          echo "=== Runner: can we create a dummy TUN? (definitive test) ==="
-          if command -v ip >/dev/null 2>&1; then
-            if ip tuntap add dev nbtest0 mode tun 2>/tmp/tunerr; then
-              echo "SUCCESS: created TUN interface -> NET_ADMIN + TUN available"
-              ip tuntap del dev nbtest0 mode tun 2>/dev/null || true
-            else
-              echo "FAILED to create TUN interface -> $(cat /tmp/tunerr)"
-              echo "This is almost certainly why 'netbird up' hangs."
-            fi
-          else
-            echo "iproute2 'ip' not available"
-          fi
-
-          echo "=== done (this step never fails the build) ==="
-        continue-on-error: true
-
       - name: Netbird Connect
         uses: Alemiz112/netbird-connect@v1
         with: