[PIE-1] add api docker files

api/Dockerfile

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+FROM alpine:latest
+
+ARG PB_VERSION=0.29.2
+ENV PB_DATA_DIR=/pb_data
+
+WORKDIR /pb
+
+RUN apk add --no-cache \
+    unzip \
+    curl \
+    ca-certificates \
+    bash
+
+# download and unzip PocketBase
+ADD https://github.com/pocketbase/pocketbase/releases/download/v${PB_VERSION}/pocketbase_${PB_VERSION}_linux_amd64.zip /tmp/pb.zip
+RUN unzip /tmp/pb.zip -d /pb/
+
+# copy entrypoint
+COPY docker-entrypoint.sh /usr/local/bin/
+RUN chmod +x /usr/local/bin/docker-entrypoint.sh
+
+EXPOSE 8080
+
+ENTRYPOINT ["docker-entrypoint.sh"]
+CMD ["serve", "--http=0.0.0.0:8080"]

api/docker-entrypoint.sh

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+#!/usr/bin/env bash
+set -e
+
+# Required env-vars
+: "${PB_ADMIN_EMAIL:?need PB_ADMIN_EMAIL}"
+: "${PB_ADMIN_PASSWORD:?need PB_ADMIN_PASSWORD}"
+: "${PB_DATA_DIR:?need PB_DATA_DIR}"
+
+# ensure data dir exists (for embedded SQLite + migrations + files)
+mkdir -p "${PB_DATA_DIR}"
+export POCKETBASE_DATA_DIR="${PB_DATA_DIR}"
+
+# if there are no users yet, create the superuser
+# we check the sqlite file for any existing record in the users table
+if [ ! -f "${PB_DATA_DIR}/pb_data.db" ] || ! \
+     sqlite3 "${PB_DATA_DIR}/pb_data.db" \
+       "SELECT id FROM users WHERE email='${PB_ADMIN_EMAIL}' LIMIT 1;" \
+       | grep -q .; then
+
+  echo ">>> Creating PocketBase superuser: ${PB_ADMIN_EMAIL}"
+  /pb/pocketbase superuser create "${PB_ADMIN_EMAIL}" "${PB_ADMIN_PASSWORD}"
+else
+  echo ">>> Superuser ${PB_ADMIN_EMAIL} already exists, skipping creation."
+fi
+
+# exec the real pocketbase binary with any passed arguments
+exec /pb/pocketbase "$@"