diff --git a/.gitea/workflows/releases.yml b/.gitea/workflows/releases.yml
index 3cb15a9..a269179 100644
--- a/.gitea/workflows/releases.yml
+++ b/.gitea/workflows/releases.yml
@@ -8,6 +8,8 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
+    container:
+      image: espressif/idf:v5.5
 
     steps:
       # ------------------------------------------------------------
@@ -16,97 +18,21 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
-      # ------------------------------------------------------------
-      # System dependencies
-      # ------------------------------------------------------------
-      - name: Install system dependencies
+      - name: Configure Git Safe Directory
         shell: bash
         run: |
-          sudo apt-get update
-
-          sudo apt-get install -y \
-            git \
-            wget \
-            flex \
-            bison \
-            gperf \
-            python3 \
-            python3-pip \
-            python3-venv \
-            cmake \
-            ninja-build \
-            ccache \
-            libffi-dev \
-            libssl-dev \
-            dfu-util
+          git config --global --add safe.directory "$GITHUB_WORKSPACE" || true
 
       # ------------------------------------------------------------
-      # Cache ESP-IDF and Espressif tools
-      # ------------------------------------------------------------
-      - name: Cache ESP-IDF
-        uses: actions/cache@v4
-        with:
-          path: |
-            ~/esp/esp-idf
-            ~/.espressif
-          key: esp-idf-5.5-esp32-${{ runner.os }}
-          restore-keys: |
-            esp-idf-5.5-esp32-
-
-      # ------------------------------------------------------------
-      # Install ESP-IDF 5.5
-      # ------------------------------------------------------------
-      - name: Install ESP-IDF 5.5
-        shell: bash
-        run: |
-          mkdir -p "$HOME/esp"
-
-          if [ ! -f "$HOME/esp/esp-idf/export.sh" ]; then
-            echo "ESP-IDF not found in cache."
-            echo "Cloning ESP-IDF 5.5..."
-
-            git clone --recursive \
-              --branch v5.5 \
-              https://github.com/espressif/esp-idf.git \
-              "$HOME/esp/esp-idf"
-
-            cd "$HOME/esp/esp-idf"
-
-            ./install.sh esp32
-          else
-            echo "Using cached ESP-IDF."
-          fi
-
-      # ------------------------------------------------------------
-      # Verify ESP-IDF
-      # ------------------------------------------------------------
-      - name: Verify ESP-IDF
-        shell: bash
-        run: |
-          source "$HOME/esp/esp-idf/export.sh"
-
-          echo "ESP-IDF:"
-          idf.py --version
-
-      # ------------------------------------------------------------
-      # Build firmware
+      # Build firmware & merged binary
       # ------------------------------------------------------------
       - name: Build firmware
         shell: bash
         run: |
-          source "$HOME/esp/esp-idf/export.sh"
-
+          . /opt/esp/idf/export.sh
+          idf.py --version
           idf.py set-target esp32
           idf.py build
-
-      # ------------------------------------------------------------
-      # Create merged firmware image
-      # ------------------------------------------------------------
-      - name: Create merged firmware
-        shell: bash
-        run: |
-          source "$HOME/esp/esp-idf/export.sh"
-
           idf.py merge-bin
 
       # ------------------------------------------------------------