Add script to push Docker images to desktop

Add scripts/push-images-to-desktop.sh: a Bash utility (set -euo pipefail) to transfer local Docker images to a remote via Tailscale SSH. The script groups images by image ID so shared layers are only sent once, queries the remote for existing image IDs to skip duplicates, and streams docker save | tailscale ssh <remote> "docker load". It emits progress, tracks transferred/skipped counts, and writes a timestamped log to /tmp/docker-push-<timestamp>.log. Remote target and log path are configurable via REMOTE and LOG variables.

scripts/push-images-to-desktop.sh

@@ -0,0 +1,65 @@
+#!/usr/bin/env bash
+# Transfer all local Docker images to rdesktop via Tailscale SSH
+# Groups images by ID so shared layers are only sent once.
+
+set -euo pipefail
+
+REMOTE="r@rdesktop.taild98fe6.ts.net"
+LOG="/tmp/docker-push-$(date +%Y%m%d-%H%M%S).log"
+
+echo "=== Docker image transfer to rdesktop ===" | tee "$LOG"
+echo "Started: $(date)" | tee -a "$LOG"
+echo "" | tee -a "$LOG"
+
+# Get image IDs already on remote
+echo "Fetching remote image IDs..." | tee -a "$LOG"
+REMOTE_IDS=$(tailscale ssh "$REMOTE" \
+    "docker images --format '{{.ID}}'" 2>/dev/null \
+    | grep -v Warning | grep -v Authentication \
+    | grep -v "Time since" || true)
+
+# Build list: <id> <tag1> [<tag2> ...]
+declare -A ID_TAGS
+while IFS=$'\t' read -r id tag; do
+    ID_TAGS["$id"]="${ID_TAGS[$id]:-} $tag"
+done < <(docker images --format '{{.ID}}\t{{.Repository}}:{{.Tag}}')
+
+TOTAL=${#ID_TAGS[@]}
+COUNT=0
+SKIPPED=0
+TRANSFERRED=0
+
+for id in "${!ID_TAGS[@]}"; do
+    COUNT=$((COUNT + 1))
+    TAGS="${ID_TAGS[$id]}"
+    FIRST_TAG=$(echo "$TAGS" | awk '{print $1}')
+
+    # Check if already on remote
+    if echo "$REMOTE_IDS" | grep -q "^${id}"; then
+        echo "[$COUNT/$TOTAL] SKIP  $id ($TAGS)" | tee -a "$LOG"
+        SKIPPED=$((SKIPPED + 1))
+        continue
+    fi
+
+    echo "[$COUNT/$TOTAL] SEND  $id →$TAGS" | tee -a "$LOG"
+    START=$(date +%s)
+
+    # shellcheck disable=SC2086
+    if docker save $TAGS \
+        | tailscale ssh "$REMOTE" "docker load" \
+        >> "$LOG" 2>&1; then
+        END=$(date +%s)
+        ELAPSED=$((END - START))
+        echo "  ✓ done in ${ELAPSED}s" | tee -a "$LOG"
+        TRANSFERRED=$((TRANSFERRED + 1))
+    else
+        echo "  ✗ FAILED" | tee -a "$LOG"
+    fi
+done
+
+echo "" | tee -a "$LOG"
+echo "=== Transfer complete ===" | tee -a "$LOG"
+echo "Finished:     $(date)" | tee -a "$LOG"
+echo "Transferred:  $TRANSFERRED" | tee -a "$LOG"
+echo "Skipped:      $SKIPPED" | tee -a "$LOG"
+echo "Log:          $LOG" | tee -a "$LOG"