release: bump version to 0.42.0

docs/technical/en/ops-docker-compose-buildx-upgrade.md

@@ -0,0 +1,105 @@
+# Docker + Compose + Buildx Upgrade Guide
+
+Process: remove old version → install new version → verify
+
+---
+
+# 1. Remove Old Version
+
+## Remove apt-installed packages
+
+```bash
+sudo apt remove -y docker.io docker-compose docker-compose-v2 docker-doc podman-docker containerd runc
+```
+
+---
+
+## Remove system `docker-compose` (V1)
+
+```bash
+sudo rm -f "$(which docker-compose 2>/dev/null)"
+```
+
+---
+
+## Find and remove manually installed Buildx plugin
+
+```bash
+docker info | sed -n '/Plugins:/,/^ Server:/p' | grep -A2 buildx
+```
+
+Get the `Path` from the output, then run:
+
+```bash
+rm -f <path to docker-buildx file>
+```
+
+---
+
+## Clean up unused dependencies
+
+```bash
+sudo apt autoremove -y
+```
+
+---
+
+# 2. Install Official Docker
+
+Includes Docker Engine, Docker Compose plugin, and Docker Buildx plugin.
+
+## Install dependencies
+
+```bash
+sudo apt update
+sudo apt install -y ca-certificates curl gnupg
+```
+
+---
+
+## Add Docker GPG key
+
+```bash
+sudo install -m 0755 -d /etc/apt/keyrings
+curl -fsSL https://download.docker.com/linux/ubuntu/gpg | \
+  sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg
+sudo chmod a+r /etc/apt/keyrings/docker.gpg
+```
+
+---
+
+## Add official repository
+
+```bash
+echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | \
+sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
+```
+
+---
+
+## Install Docker + Compose + Buildx
+
+```bash
+sudo apt update
+sudo apt install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
+```
+
+---
+
+# 3. Verify Installation
+
+```bash
+docker --version
+docker compose version
+docker buildx version
+```
+
+---
+
+# 4. Common Commands
+
+```bash
+docker compose up -d
+docker compose down
+docker buildx build .
+```