tinqs/ci — composite actions + Lambda dispatcher for Spot CI runners

Actions: checkout, setup-go, setup-node, setup-aws
Dispatcher: Lambda → EC2 Spot (ephemeral, self-terminating)
Images: base, go, node, docker, deploy, godot

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

images/base/Dockerfile

@@ -0,0 +1,20 @@
+# tinqs/ci base — shared foundation for all runner images
+# Alpine + git + bash + curl + AWS CLI + ssh
+# Every other image builds FROM this.
+
+FROM alpine:3.23
+
+RUN apk add --no-cache \
+    bash git curl wget unzip tar \
+    ca-certificates openssh-client \
+    tzdata
+
+# AWS CLI (needed by almost every workflow)
+RUN curl -fsSL https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip -o /tmp/awscli.zip && \
+    unzip -q /tmp/awscli.zip -d /tmp && \
+    /tmp/aws/install && \
+    rm -rf /tmp/awscli.zip /tmp/aws
+
+RUN git --version && aws --version
+
+WORKDIR /workspace