minify appview container

Dockerfile.appview

@@ -1,41 +1,71 @@
-# Build stage
-FROM golang:1.24-alpine AS builder
+# ==========================================
+# Stage 1: Build stage with Debian (glibc)
+# ==========================================
+FROM golang:1.25.2-trixie AS builder
 
-# Install build dependencies (gcc and musl-dev needed for SQLite CGO)
-RUN apk add --no-cache git make gcc musl-dev sqlite-dev
+# Install SQLite development libraries (for CGO compilation)
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends sqlite3 libsqlite3-dev && \
+    rm -rf /var/lib/apt/lists/*
 
 # Set working directory
 WORKDIR /build
 
-# Copy go mod files
+# Copy go mod files and download dependencies (cached layer)
 COPY go.mod go.sum ./
-
-# Download dependencies
 RUN go mod download
 
 # Copy source code
 COPY . .
 
-# Build the binary with CGO enabled for SQLite support
-RUN CGO_ENABLED=1 GOOS=linux go build -a -o atcr-appview ./cmd/appview
+# Build optimized binary:
+# - CGO_ENABLED=1: Required for SQLite (mattn/go-sqlite3)
+# - -ldflags="-s -w": Strip debug symbols (~30% size reduction)
+# - -tags sqlite_omit_load_extension: Remove SQLite extension loading (~100KB savings)
+# - -trimpath: Remove build paths (reproducible builds)
+# SQLite is statically embedded in the binary (no runtime .so needed)
+RUN CGO_ENABLED=1 go build \
+    -ldflags="-s -w" \
+    -tags sqlite_omit_load_extension \
+    -trimpath \
+    -o atcr-appview ./cmd/appview
 
-# Runtime stage
-FROM alpine:latest
+# Collect minimal runtime dependencies based on ldd output
+RUN mkdir -p /runtime-deps/lib/x86_64-linux-gnu /runtime-deps/lib64 && \
+    # Core glibc library (only one the binary links to)
+    cp -L /lib/x86_64-linux-gnu/libc.so.6 /runtime-deps/lib/x86_64-linux-gnu/ && \
+    # Dynamic linker
+    cp -L /lib64/ld-linux-x86-64.so.2 /runtime-deps/lib64/ && \
+    # NSS modules for DNS resolution (loaded via dlopen at runtime, not shown in ldd)
+    cp -L /lib/x86_64-linux-gnu/libnss_dns.so.2 /runtime-deps/lib/x86_64-linux-gnu/ && \
+    cp -L /lib/x86_64-linux-gnu/libnss_files.so.2 /runtime-deps/lib/x86_64-linux-gnu/ && \
+    # NSS modules depend on libresolv
+    cp -L /lib/x86_64-linux-gnu/libresolv.so.2 /runtime-deps/lib/x86_64-linux-gnu/ && \
+    # Create NSS config (tells glibc to check /etc/hosts then DNS)
+    echo "hosts: files dns" > /tmp/nsswitch.conf
 
-# Install CA certificates for HTTPS, SQLite runtime libraries, and sqlite CLI for debugging
-RUN apk --no-cache add ca-certificates sqlite-libs sqlite
+# ==========================================
+# Stage 2: Minimal FROM scratch runtime
+# ==========================================
+FROM scratch
 
-# Set working directory
-WORKDIR /app
+# Copy minimal glibc runtime dependencies
+COPY --from=builder /runtime-deps /
 
-# Copy binary from builder
-COPY --from=builder /build/atcr-appview .
+# Copy NSS configuration for DNS resolution
+COPY --from=builder /tmp/nsswitch.conf /etc/nsswitch.conf
 
-# Create directories for storage
-RUN mkdir -p /var/lib/atcr/blobs /var/lib/atcr/auth
+# Copy CA certificates for HTTPS (PDS, Jetstream, relay connections)
+COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
 
-# Expose ports
-EXPOSE 5000 5001
+# Copy timezone data for timestamp formatting
+COPY --from=builder /usr/share/zoneinfo /usr/share/zoneinfo
+
+# Copy optimized binary (SQLite embedded)
+COPY --from=builder /build/atcr-appview /atcr-appview
+
+# Expose port (main HTTP server)
+EXPOSE 5000
 
 # OCI image annotations
 LABEL org.opencontainers.image.title="ATCR AppView" \
@@ -48,5 +78,6 @@ LABEL org.opencontainers.image.title="ATCR AppView" \
       io.atcr.icon="https://imgs.blue/evan.jarrett.net/1TpTNrRelfloN2emuWZDrWmPT0o93bAjEnozjD6UPgoVV9m4"
 
 # Run the AppView (no config file - uses environment variables)
-ENTRYPOINT ["/app/atcr-appview"]
+# Creates /var/lib/atcr directories on first run via Go code
+ENTRYPOINT ["/atcr-appview"]
 CMD ["serve"]