feat: add Gitea Action Runner base and Java images

- gitea_runner_base: base image with common build tools (git, curl, wget, tar, etc.)
- gitea_runner_java: Java image with JDK 7/8/11/17/21 and Maven 3.9.9
- Update README with build instructions and usage examples

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.gitignore

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+/AGENTS.md
+/CLAUDE.md
+/.claude

README.md

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 # docker-files
 
-镜像 Dockerfile
+Gitea Action Runner Docker 镜像集合
+
+## 镜像列表
+
+### gitea_runner_base
+
+基于 `gitea/act_runner` 的基础镜像，包含常用构建工具：
+
+- 版本控制: git, git-lfs
+- 网络工具: curl, wget, openssl
+- 压缩工具: tar, gzip, bzip2, xz, zip, unzip
+- 构建工具: make, bash, GNU 工具链
+- 其他: jq, tree
+
+```bash
+docker build -t gitea_runner_base ./gitea_runner_base
+```
+
+### gitea_runner_java
+
+基于 `gitea_runner_base` 的 Java 开发镜像，包含：
+
+- JDK 7 (Azul Zulu)
+- JDK 8, 11, 17, 21 (OpenJDK)
+- Maven 3.9.9
+
+```bash
+docker build -t gitea_runner_java ./gitea_runner_java
+```
+
+**切换 JDK 版本：**
+
+```bash
+# 在容器内或 CI 脚本中
+source use-java 8   # 切换到 JDK 8
+source use-java 17  # 切换到 JDK 17
+```
+
+**直接指定 JAVA_HOME：**
+
+```yaml
+# Gitea Action workflow 示例
+env:
+  JAVA_HOME: /usr/lib/jvm/java-11-openjdk
+```
+
+## 构建顺序
+
+```bash
+# 1. 先构建基础镜像
+docker build -t gitea_runner_base ./gitea_runner_base
+
+# 2. 再构建语言环境镜像
+docker build -t gitea_runner_java ./gitea_runner_java
+```

gitea_runner_base/Dockerfile

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+# Gitea Action Runner Base Image
+# 基于 gitea/act_runner 添加常用构建工具，不含具体语言环境
+
+FROM gitea/act_runner:latest
+
+LABEL maintainer="www.imyeyu.com"
+LABEL description="Gitea Action Runner with basic build tools"
+
+# 安装基本构建工具
+# act_runner 基于 Alpine Linux
+RUN apk update && apk add --no-cache \
+    # 版本控制
+    git \
+    git-lfs \
+    # 网络工具
+    curl \
+    wget \
+    ca-certificates \
+    openssl \
+    # 压缩/解压工具
+    tar \
+    gzip \
+    bzip2 \
+    xz \
+    zip \
+    unzip \
+    # 基本构建工具
+    make \
+    bash \
+    coreutils \
+    findutils \
+    grep \
+    sed \
+    gawk \
+    # 其他常用工具
+    jq \
+    tree \
+    && rm -rf /var/cache/apk/*

gitea_runner_java/Dockerfile

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+# Gitea Action Runner Java Image
+# 基于 gitea_runner_base 添加多版本 JDK 和 Maven
+
+FROM gitea_runner_base:latest
+
+LABEL maintainer="www.imyeyu.com"
+LABEL description="Gitea Action Runner with JDK 7/8/11/17/21 and Maven 3"
+
+# JDK 安装目录
+ENV JAVA_BASE=/usr/lib/jvm
+
+# 安装 Alpine 仓库中的 OpenJDK 版本
+RUN apk add --no-cache \
+    openjdk8 \
+    openjdk11 \
+    openjdk17 \
+    openjdk21
+
+# JDK 7 - 从 Azul Zulu 下载 (Alpine musl 版本)
+ARG ZULU7_VERSION=7.56.0.11-ca-jdk7.0.352
+ARG ZULU7_URL=https://cdn.azul.com/zulu/bin/zulu${ZULU7_VERSION}-linux_musl_x64.tar.gz
+RUN mkdir -p ${JAVA_BASE} \
+    && wget -q ${ZULU7_URL} -O /tmp/zulu7.tar.gz \
+    && tar -xzf /tmp/zulu7.tar.gz -C ${JAVA_BASE} \
+    && mv ${JAVA_BASE}/zulu${ZULU7_VERSION}-linux_musl_x64 ${JAVA_BASE}/java-7-zulu \
+    && rm /tmp/zulu7.tar.gz
+
+# Maven 3
+ARG MAVEN_VERSION=3.9.9
+ARG MAVEN_URL=https://dlcdn.apache.org/maven/maven-3/${MAVEN_VERSION}/binaries/apache-maven-${MAVEN_VERSION}-bin.tar.gz
+ENV MAVEN_HOME=/opt/maven
+RUN mkdir -p ${MAVEN_HOME} \
+    && wget -q ${MAVEN_URL} -O /tmp/maven.tar.gz \
+    && tar -xzf /tmp/maven.tar.gz -C ${MAVEN_HOME} --strip-components=1 \
+    && rm /tmp/maven.tar.gz \
+    && ln -s ${MAVEN_HOME}/bin/mvn /usr/local/bin/mvn
+
+# 默认使用 JDK 17
+ENV JAVA_HOME=${JAVA_BASE}/java-17-openjdk
+ENV PATH="${JAVA_HOME}/bin:${MAVEN_HOME}/bin:${PATH}"
+
+# 创建版本切换脚本
+RUN cat > /usr/local/bin/use-java << 'EOF'
+#!/bin/bash
+case "$1" in
+    7)  export JAVA_HOME=/usr/lib/jvm/java-7-zulu ;;
+    8)  export JAVA_HOME=/usr/lib/jvm/java-1.8-openjdk ;;
+    11) export JAVA_HOME=/usr/lib/jvm/java-11-openjdk ;;
+    17) export JAVA_HOME=/usr/lib/jvm/java-17-openjdk ;;
+    21) export JAVA_HOME=/usr/lib/jvm/java-21-openjdk ;;
+    *)  echo "Usage: source use-java [7|8|11|17|21]"; return 1 ;;
+esac
+export PATH="${JAVA_HOME}/bin:${PATH}"
+echo "Switched to Java $1: $(java -version 2>&1 | head -1)"
+EOF
+RUN chmod +x /usr/local/bin/use-java
+
+# 验证安装
+RUN echo "=== Installed JDK versions ===" \
+    && echo "JDK 7:  $(/usr/lib/jvm/java-7-zulu/bin/java -version 2>&1 | head -1)" \
+    && echo "JDK 8:  $(/usr/lib/jvm/java-1.8-openjdk/bin/java -version 2>&1 | head -1)" \
+    && echo "JDK 11: $(/usr/lib/jvm/java-11-openjdk/bin/java -version 2>&1 | head -1)" \
+    && echo "JDK 17: $(/usr/lib/jvm/java-17-openjdk/bin/java -version 2>&1 | head -1)" \
+    && echo "JDK 21: $(/usr/lib/jvm/java-21-openjdk/bin/java -version 2>&1 | head -1)" \
+    && echo "Maven:  $(mvn -version 2>&1 | head -1)"