added Dockerfile and CI file

.woodpecker.yml

@@ -0,0 +1,12 @@
+pipeline:
+  dockerfile:
+    image: woodpeckerci/plugin-docker-buildx
+    settings:
+      platforms: linux/amd64
+      repo: git.freifunk-rhein-sieg.net/Freifunk-Troisdorf/docker-gluon-build
+      registry: https://git.freifunk-rhein-sieg.net
+      tags: latest
+      auto_tag: true
+      username: api_user
+      password:
+        from_secret: gitpw

Dockerfile

@@ -0,0 +1,36 @@
+FROM debian:bullseye-slim
+
+ARG DEBIAN_FRONTEND=noninteractive
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    ca-certificates \
+    file \
+    git \
+    python3 \
+    build-essential \
+    gawk \
+    unzip \
+    libncurses5-dev \
+    zlib1g-dev \
+    libssl-dev \
+    libelf-dev \
+    wget \
+    rsync \
+    time \
+    qemu-utils \
+    ecdsautils \
+    lua-check \
+    shellcheck \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN mkdir /tmp/ec &&\
+    wget -O /tmp/ec/ec-linux-amd64.tar.gz https://github.com/editorconfig-checker/editorconfig-checker/releases/download/2.7.0/ec-linux-amd64.tar.gz &&\
+    tar -xvzf /tmp/ec/ec-linux-amd64.tar.gz &&\
+    mv bin/ec-linux-amd64 /usr/local/bin/editorconfig-checker &&\
+    rm -rf /tmp/ec
+
+RUN useradd -d /gluon gluon
+USER gluon
+
+VOLUME /gluon
+WORKDIR /gluon