chore: add Docker build/push script targeting Gitea registry and use published image in README

scripts/docker-build-push.sh

@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+REGISTRY=${REGISTRY:-gitea.anthonybouteiller.ovh}
+OWNER=${OWNER:-blomios}
+IMAGE_NAME=${IMAGE_NAME:-nodecast-tv}
+TAG=${TAG:-latest}
+IMAGE="${REGISTRY}/${OWNER}/${IMAGE_NAME}:${TAG}"
+
+push_image=true
+if [[ "${1:-}" == "--no-push" ]]; then
+    push_image=false
+elif [[ $# -gt 0 ]]; then
+    echo "Usage: $0 [--no-push]" >&2
+    exit 2
+fi
+
+if ! command -v docker >/dev/null 2>&1; then
+    echo "Error: docker is required but was not found in PATH." >&2
+    exit 1
+fi
+
+repo_dir=$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)
+
+echo "Target image: ${IMAGE}"
+docker build --file "${repo_dir}/Dockerfile" --tag "${IMAGE}" "${repo_dir}"
+
+if [[ "${DRY_RUN:-false}" == "true" || "${push_image}" == "false" ]]; then
+    echo "Push skipped."
+    exit 0
+fi
+
+docker push "${IMAGE}"