Add mergedrop: drag-and-drop video merger (ffmpeg + FastAPI + React)

apps/mergedrop/build/README.md

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+# MergeDrop image build
+
+The Dockerfile and full source for the **MergeDrop** image live in a separate Gitea repo:
+
+- Source: <https://git.alexzaw.dev/alexz/video-merger>
+- Published image: `git.alexzaw.dev/alexz/mergedrop:<tag>`
+
+This folder holds only a thin helper script (`build.sh`) that clones the source
+repo and pushes the resulting image to the in-house Docker registry.
+
+## Rebuild
+
+```bash
+cd build/
+./build.sh                                 # builds + pushes :latest and the version tag
+IMAGE_TAG=1.0.1 ./build.sh                 # override the tag
+```
+
+Requires `docker login git.alexzaw.dev` to already be done (or `~/.docker/config.json`
+to have the registry credentials, which is the case on this host).
+
+## Notes
+
+- The image is a two-stage build (Node 20 → Python 3.11-slim) and produces an
+  `amd64` image only. Add `--platform linux/arm64` to `build.sh` args to cross-build.
+- The application is a single FastAPI process that serves the static React build
+  and a `/api/*` JSON API on the same port (`8000` inside the container).
+- `ffmpeg` is installed in the runtime image; no host-level ffmpeg required.

apps/mergedrop/build/build.sh

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+#!/bin/bash
+# Build and push the MergeDrop Docker image.
+# Clones the source repo (or reuses an existing checkout) and tags/pushes
+# both :latest and the version tag.
+
+set -euo pipefail
+
+IMAGE_NAME="${IMAGE_NAME:-git.alexzaw.dev/alexz/mergedrop}"
+IMAGE_TAG="${IMAGE_TAG:-1.0.0}"
+SOURCE_REPO="${SOURCE_REPO:-https://git.alexzaw.dev/alexz/video-merger.git}"
+WORKDIR="${WORKDIR:-/tmp/mergedrop-build}"
+
+echo "==> Preparing source at ${WORKDIR}"
+if [[ -d "${WORKDIR}/.git" ]]; then
+    git -C "${WORKDIR}" fetch --quiet origin
+    git -C "${WORKDIR}" reset --hard --quiet origin/HEAD
+else
+    rm -rf "${WORKDIR}"
+    git clone --quiet "${SOURCE_REPO}" "${WORKDIR}"
+fi
+
+echo "==> Building ${IMAGE_NAME}:${IMAGE_TAG} (and :latest)"
+cd "${WORKDIR}"
+docker build "$@" \
+    -t "${IMAGE_NAME}:${IMAGE_TAG}" \
+    -t "${IMAGE_NAME}:latest" \
+    .
+
+echo "==> Pushing ${IMAGE_NAME}:${IMAGE_TAG}"
+docker push "${IMAGE_NAME}:${IMAGE_TAG}"
+echo "==> Pushing ${IMAGE_NAME}:latest"
+docker push "${IMAGE_NAME}:latest"
+
+echo ""
+echo "Done. To install on Runtipi:"
+echo "  sudo /etc/runtipi/runtipi-cli appstore update"
+echo "  sudo /etc/runtipi/runtipi-cli app install mergedrop:runtipi"