chore: use dockerfile as jenkins agent

Dockerfile

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+FROM lochnair/alpine-sdk:latest
+
+USER root
+# Install required dependencies
+RUN apk add --no-cache \
+    bash \
+    curl \
+    gcc \
+    musl-dev \
+    libgcc \
+    openssl-dev \
+    pkgconfig \
+    make \
+    git \
+    rustup
+
+RUN GCC_TARGETS="aarch64-linux-musl arm-linux-musleabi armv7m-linux-musleabi armv7l-linux-musleabihf mips-linux-muslsf mips64-linux-musl mips64el-linux-musl mipsel-linux-muslsf x86_64-linux-musl" && \
+    for GCC_TARGET in $GCC_TARGETS; do \
+        TOOLCHAIN_URL="https://musl.cc/${GCC_TARGET}-cross.tgz"; \
+        wget -O- ${TOOLCHAIN_URL} | tar -xz -C /opt; \
+    done
+
+USER sdk
+
+# Install Rust and set up rustup
+RUN rustup-init -y && \
+    source $HOME/.cargo/env && \
+    rustup update nightly && \
+    rustup default nightly && \
+    rustup component add rust-src --toolchain nightly
+