add mosis-portal Go project with package signing and validation

portal/Dockerfile

@@ -0,0 +1,50 @@
+# Multi-stage build for mosis-portal
+FROM golang:1.22-alpine AS builder
+
+WORKDIR /build
+
+# Install build dependencies
+RUN apk add --no-cache ca-certificates
+
+# Copy go.mod and go.sum
+COPY go.mod go.sum ./
+RUN go mod download
+
+# Copy source code
+COPY . .
+
+# Build the binary
+RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-s -w" -o mosis-portal ./cmd/server
+
+# Final image
+FROM alpine:3.19
+
+WORKDIR /app
+
+# Install runtime dependencies
+RUN apk add --no-cache ca-certificates tzdata
+
+# Install Litestream
+RUN wget -q https://github.com/benbjohnson/litestream/releases/download/v0.3.13/litestream-v0.3.13-linux-amd64.tar.gz && \
+    tar -xzf litestream-v0.3.13-linux-amd64.tar.gz && \
+    mv litestream /usr/local/bin/ && \
+    rm litestream-v0.3.13-linux-amd64.tar.gz
+
+# Copy binary from builder
+COPY --from=builder /build/mosis-portal /app/mosis-portal
+
+# Copy Litestream config
+COPY litestream.yml /etc/litestream.yml
+
+# Create data directories
+RUN mkdir -p /data /packages /backups
+
+# Expose port
+EXPOSE 8080
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+    CMD wget --no-verbose --tries=1 --spider http://localhost:8080/health || exit 1
+
+# Run with Litestream for continuous backup
+ENTRYPOINT ["litestream", "replicate", "-exec", "/app/mosis-portal"]