Docker DinD with Forgejo Runner built it

.forgejo/workflows/ci.yml

@@ -6,9 +6,9 @@ on:
   schedule:
     - cron: '0 7 * * 0'
   push:
-    branches: ["dev"]
+    branches: ["*"]
   pull_request:
-    branches: ["dev"]
+    branches: ["*"]
 
 jobs:
   build:
@@ -16,7 +16,7 @@ jobs:
     strategy:
       matrix:
         # image: ["linux-clang-format", "linux-fresh", "linux-mingw", "linux-transifex"]
-        image: ["linux-clang-format", "linux-fresh", "linux-mingw"]
+        image: ["forgejo-runner-dind", "linux-clang-format", "linux-fresh", "linux-mingw"]
     
     steps:
     - uses: https://github.com/actions/checkout@v2

forgejo-runner-dind/Dockerfile

@@ -0,0 +1,111 @@
+#
+# NOTE: THIS DOCKERFILE IS GENERATED VIA "apply-templates.sh"
+#
+# PLEASE DO NOT EDIT IT DIRECTLY.
+#
+
+FROM docker:26-cli
+
+# https://github.com/moby/moby/blob/0eecd59153c03ced5f5ddd79cc98f29e4d86daec/project/PACKAGERS.md#runtime-dependencies
+# https://github.com/docker/docker-ce-packaging/blob/963aa02666035d4e268f33c63d7868d6cdd1d34c/deb/common/control#L28-L41
+RUN set -eux; \
+	apk add --no-cache \
+		btrfs-progs \
+		e2fsprogs \
+		e2fsprogs-extra \
+		git \
+		ip6tables \
+		iptables \
+		openssl \
+		pigz \
+		shadow-uidmap \
+		xfsprogs \
+		xz \
+		zfs \
+	;
+
+# dind might be used on systems where the nf_tables kernel module isn't available. In that case,
+# we need to switch over to xtables-legacy. See https://github.com/docker-library/docker/issues/463
+RUN set -eux; \
+	apk add --no-cache iptables-legacy; \
+# set up a symlink farm we can use PATH to switch to legacy with
+	mkdir -p /usr/local/sbin/.iptables-legacy; \
+# https://git.alpinelinux.org/aports/tree/main/iptables/APKBUILD?id=b215d54de159eacafecb13c68dfadce6eefd9ec9#n73
+	for f in \
+		iptables \
+		iptables-save \
+		iptables-restore \
+		ip6tables \
+		ip6tables-save \
+		ip6tables-restore \
+	; do \
+# "iptables-save" -> "iptables-legacy-save", "ip6tables" -> "ip6tables-legacy", etc.
+# https://pkgs.alpinelinux.org/contents?branch=v3.19&name=iptables-legacy&arch=x86_64
+		b="/sbin/${f/tables/tables-legacy}"; \
+		"$b" --version; \
+		ln -svT "$b" "/usr/local/sbin/.iptables-legacy/$f"; \
+	done; \
+# verify it works (and gets us legacy)
+	export PATH="/usr/local/sbin/.iptables-legacy:$PATH"; \
+	iptables --version | grep legacy
+
+# set up subuid/subgid so that "--userns-remap=default" works out-of-the-box
+RUN set -eux; \
+	addgroup -S dockremap; \
+	adduser -S -G dockremap dockremap; \
+	echo 'dockremap:165536:65536' >> /etc/subuid; \
+	echo 'dockremap:165536:65536' >> /etc/subgid
+
+RUN set -eux; \
+	\
+	apkArch="$(apk --print-arch)"; \
+	case "$apkArch" in \
+		'x86_64') \
+			url='https://download.docker.com/linux/static/stable/x86_64/docker-26.0.0.tgz'; \
+			;; \
+		'armhf') \
+			url='https://download.docker.com/linux/static/stable/armel/docker-26.0.0.tgz'; \
+			;; \
+		'armv7') \
+			url='https://download.docker.com/linux/static/stable/armhf/docker-26.0.0.tgz'; \
+			;; \
+		'aarch64') \
+			url='https://download.docker.com/linux/static/stable/aarch64/docker-26.0.0.tgz'; \
+			;; \
+		*) echo >&2 "error: unsupported 'docker.tgz' architecture ($apkArch)"; exit 1 ;; \
+	esac; \
+	\
+	wget -O 'docker.tgz' "$url"; \
+	\
+	tar --extract \
+		--file docker.tgz \
+		--strip-components 1 \
+		--directory /usr/local/bin/ \
+		--no-same-owner \
+# we exclude the CLI binary because we already extracted that over in the "docker:26-cli" image that we're FROM and we don't want to duplicate those bytes again in this layer
+		--exclude 'docker/docker' \
+	; \
+	rm docker.tgz; \
+	\
+	dockerd --version; \
+	containerd --version; \
+	ctr --version; \
+	runc --version
+
+# https://github.com/docker/docker/tree/master/hack/dind
+ENV DIND_COMMIT 65cfcc28ab37cb75e1560e4b4738719c07c6618e
+
+RUN set -eux; \
+	wget -O /usr/local/bin/dind "https://raw.githubusercontent.com/docker/docker/${DIND_COMMIT}/hack/dind"; \
+	chmod +x /usr/local/bin/dind \
+	wget -O /usr/local/bin/forgejo-runner https://code.forgejo.org/forgejo/runner/releases/download/v3.3.0/forgejo-runner-3.3.0-linux-amd64 \
+	chmod +x /usr/local/bin/forgejo-runner
+
+COPY dockerd-entrypoint.sh /usr/local/bin/
+
+VOLUME /var/lib/docker
+EXPOSE 2375 2376
+
+ENTRYPOINT ["dockerd-entrypoint.sh"]
+CMD []
+