infra: [FIXME] add docker build ci

This currently doesn't work. I gotta figure out how to add a ci bot
properly to gitea

.docker/Dockerfile

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+FROM gentoo/stage3:latest
+
+USER root
+
+# Fix permissions for distfiles directory
+RUN mkdir -p /var/cache/distfiles && \
+    chmod 755 /var/cache/distfiles && \
+    chown -R portage:portage /var/cache/distfiles
+
+# enable bintoo
+RUN echo "BINPKG_FORMAT=\"gpkg\"" >> /etc/portage/make.conf
+RUN echo "EMERGE_DEFAULT_OPTS=\"\${EMERGE_DEFAULT_OPTS} --getbinpkg\"" >> /etc/portage/make.conf
+RUN echo "FEATURES=\"getbinpkg\"" >> /etc/portage/make.conf
+
+RUN getuto
+
+RUN emerge-webrsync && \
+    emerge --sync
+
+# get super latest meson
+RUN echo "=dev-build/meson-9999 **" >> /etc/portage/package.accept_keywords/package.accept
+RUN emerge --ask=n =dev-build/meson-9999
+RUN meson --version
+
+# install nightly rust
+RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain nightly
+RUN source "$HOME/.cargo/env" && rustc --version && cargo --version
+
+RUN emerge --ask=n dev-vcs/git
+
+# Set working directory
+WORKDIR /workspace
+
+# Default command
+CMD ["/bin/bash"]

.gitea/workflows/docker.yml

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+# name: Build gentoo-utils docker image
+
+# on:
+#   push:
+#     branches:
+#       - master
+#     paths:
+#       - '.docker/Dockerfile'
+#   pull_request:
+#     paths:
+#       - '.docker/Dockerfile'
+#   workflow_dispatch:
+
+# jobs:
+#   build-docker:
+#     runs-on: ubuntu-latest
+
+#     steps:
+#       - name: Checkout repo
+#         uses: actions/checkout@v4
+
+#       - name: Set up Docker buildx
+#         uses: docker/setup-buildx-action@v3
+
+#       - name: Log in to Github Container Registry
+#         uses: docker/login-action@v3
+#         with:
+#           registry: ${{ secrets.PIPELINE_REGISTRY_URL }}
+#           username: ${{ github.actor }}
+#           password: ${{ secrets.GITHUB_TOKEN }}
+
+#       - name: Extract metadata for Docker
+#         id: meta
+#         uses: docker/metadata-action@v5
+#         with:
+#           images: ghcr.op/${{ github.repository_owner }}/gentoo-utils-builder
+#           tags: |
+#             type=raw,value=latest
+#             type=sha,prefix={{branch}}-
+
+#       -name: Build and push docker image