refactor: appiattisce docker/build/ in docker/

Con la rimozione di docker/dev/ non serve più distinguere due
container: Dockerfile e build.sh salgono di un livello, con i path
relativi (PROJECT_ROOT, keystore) aggiornati di conseguenza.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

docker/Dockerfile

@@ -0,0 +1,36 @@
+FROM ubuntu:22.04
+
+ARG FLUTTER_VERSION=3.41.9
+ARG ANDROID_SDK_BUILD=11076708
+
+ENV DEBIAN_FRONTEND=noninteractive \
+    FLUTTER_HOME=/opt/flutter \
+    ANDROID_SDK_ROOT=/opt/android-sdk \
+    JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64 \
+    PATH="/opt/flutter/bin:/opt/android-sdk/cmdline-tools/latest/bin:/opt/android-sdk/platform-tools:/opt/android-sdk/build-tools/34.0.0:${PATH}"
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    curl wget git unzip xz-utils ca-certificates \
+    openjdk-17-jdk \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN git clone --depth 1 --branch ${FLUTTER_VERSION} \
+        https://github.com/flutter/flutter.git ${FLUTTER_HOME} && \
+    flutter config --no-analytics && \
+    flutter precache --android
+
+RUN mkdir -p ${ANDROID_SDK_ROOT}/cmdline-tools && \
+    wget -q "https://dl.google.com/android/repository/commandlinetools-linux-${ANDROID_SDK_BUILD}_latest.zip" \
+         -O /tmp/cmdtools.zip && \
+    unzip -q /tmp/cmdtools.zip -d ${ANDROID_SDK_ROOT}/cmdline-tools && \
+    mv ${ANDROID_SDK_ROOT}/cmdline-tools/cmdline-tools \
+       ${ANDROID_SDK_ROOT}/cmdline-tools/latest && \
+    rm /tmp/cmdtools.zip
+
+RUN yes | sdkmanager --licenses && \
+    sdkmanager \
+        "platform-tools" \
+        "platforms;android-34" \
+        "build-tools;34.0.0"
+
+WORKDIR /workspace

docker/build.sh

@@ -0,0 +1,78 @@
+#!/bin/bash
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROJECT_ROOT="$(cd "${SCRIPT_DIR}/.." && pwd)"
+RELEASE=false
+
+for arg in "$@"; do
+  [[ "$arg" == "--release" ]] && RELEASE=true
+done
+
+echo "→ Build immagine biteplan-build..."
+docker build -t biteplan-build "${SCRIPT_DIR}"
+
+mkdir -p "${PROJECT_ROOT}/dist"
+
+if [[ "$RELEASE" == "true" ]]; then
+  if [[ -z "${BITEPLAN_KEYSTORE_PASS}" ]]; then
+    echo "ERRORE: variabile BITEPLAN_KEYSTORE_PASS non impostata"
+    echo "Usa: export BITEPLAN_KEYSTORE_PASS=tuapassword"
+    exit 1
+  fi
+
+  KEYSTORE="${SCRIPT_DIR}/biteplan.jks"
+  if [[ ! -f "$KEYSTORE" ]]; then
+    echo "ERRORE: keystore non trovato in docker/biteplan.jks"
+    echo "Generalo con:"
+    echo "  keytool -genkey -v -keystore docker/biteplan.jks -alias biteplan -keyalg RSA -keysize 2048 -validity 10000"
+    exit 1
+  fi
+
+  echo "→ Building release APK..."
+  docker run --rm \
+    -v "${PROJECT_ROOT}:/workspace" \
+    -v "gradle-cache:/root/.gradle" \
+    biteplan-build \
+    bash -c "cd /workspace && flutter pub get --enforce-lockfile && flutter pub run flutter_launcher_icons && flutter build apk --release"
+
+  echo "→ Zipalign..."
+  rm -f "${PROJECT_ROOT}/dist/biteplan-aligned.apk"
+  docker run --rm \
+    -v "${PROJECT_ROOT}:/workspace" \
+    biteplan-build \
+    bash -c "zipalign -v -p 4 \
+      /workspace/build/app/outputs/flutter-apk/app-release.apk \
+      /workspace/dist/biteplan-aligned.apk"
+
+  echo "→ Firma APK..."
+  docker run --rm \
+    -v "${PROJECT_ROOT}:/workspace" \
+    -v "$(realpath "${KEYSTORE%/*}"):/keystore:ro" \
+    -e BITEPLAN_KEYSTORE_PASS \
+    biteplan-build \
+    bash -c "apksigner sign \
+      --ks /keystore/biteplan.jks \
+      --ks-pass \"pass:\${BITEPLAN_KEYSTORE_PASS}\" \
+      --out /workspace/dist/biteplan-release.apk \
+      /workspace/dist/biteplan-aligned.apk && \
+      rm -f /workspace/dist/biteplan-aligned.apk && \
+      apksigner verify --verbose /workspace/dist/biteplan-release.apk"
+
+  echo ""
+  echo "✓ Release APK: dist/biteplan-release.apk"
+
+else
+  echo "→ Building debug APK..."
+  docker run --rm \
+    -v "${PROJECT_ROOT}:/workspace" \
+    -v "gradle-cache:/root/.gradle" \
+    biteplan-build \
+    bash -c "cd /workspace && flutter pub get --enforce-lockfile && flutter pub run flutter_launcher_icons && flutter build apk --debug"
+
+  cp "${PROJECT_ROOT}/build/app/outputs/flutter-apk/app-debug.apk" \
+     "${PROJECT_ROOT}/dist/biteplan-debug.apk"
+
+  echo ""
+  echo "✓ Debug APK: dist/biteplan-debug.apk"
+fi