🤖 feat: simplify CI/CD structure and add Docker workflow

- Rename ci-cd.yaml to go-ci-cd.yaml for clarity
- Add dockerimage.yaml workflow for Docker builds
- Create Dockerfile for production deployment
- Add comprehensive CI/CD documentation
- Create contributor-quickstart.sh for easy validation
- Update all scripts to handle both workflow files
- Fix event triggers to run on all relevant pushes
- Remove redundant YAML syntax validation
- Improve workflow validation for Arcodange conventions

BREAKING CHANGE: ci-cd.yaml renamed to go-ci-cd.yaml
See scripts/cicd/README.md for complete documentation.

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

Dockerfile

@@ -0,0 +1,47 @@
+# DanceLessonsCoach Docker Image
+# Multi-stage build for production deployment
+
+# Stage 1: Build binary
+FROM golang:1.26.1-alpine AS builder
+
+WORKDIR /app
+
+# Copy go mod files
+COPY go.mod go.sum ./
+RUN go mod download
+
+# Copy source code
+COPY . ./
+
+# Build binary
+RUN CGO_ENABLED=0 GOOS=linux go build -o /dance-lessons-coach ./cmd/server
+
+# Stage 2: Final image
+FROM alpine:3.18
+
+WORKDIR /app
+
+# Install dependencies
+RUN apk add --no-cache ca-certificates tzdata
+
+# Copy binary from builder
+COPY --from=builder /dance-lessons-coach /app/dance-lessons-coach
+
+# Copy configuration
+COPY config.yaml /app/config.yaml
+
+# Set permissions
+RUN chmod +x /app/dance-lessons-coach
+
+# Set timezone
+ENV TZ=UTC
+
+# Expose port
+EXPOSE 8080
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=3s \
+    CMD wget -q --spider http://localhost:8080/api/health || exit 1
+
+# Entry point
+ENTRYPOINT ["/app/dance-lessons-coach"]