fix: resolve Rust compiler crash in CI environment

- Add CI-friendly Cargo profile with reduced memory usage
- Create .cargo/config.toml with memory-optimized build settings
- Add build-ci.sh script for CI environments
- Reduce parallel jobs and disable LTO to prevent SIGSEGV
- Tested locally: indexmap compiles successfully with CI profile
- Resolves CI build failure: 'signal: 11, SIGSEGV: invalid memory reference'

.cargo/config.toml

@@ -1,34 +1,14 @@
 [build]
-# Use safer optimization flags to avoid Rust compiler SIGSEGV
-# The default Debian build flags are too aggressive and cause crashes
+# Use fewer parallel jobs to reduce memory usage in CI
+jobs = 2
 
-[target.'cfg(all())']
-# Override aggressive optimization flags that cause SIGSEGV
-rustflags = [
-    "-C", "opt-level=2",           # Use safer optimization level (was 3)
-    "-C", "codegen-units=16",      # Use multiple codegen units (was 1)
-    # Remove linker-plugin-lto which causes SIGSEGV with regex-automata
-    "-C", "lto=false",             # Disable LTO to avoid crashes
-]
+[target.x86_64-unknown-linux-gnu]
+# Optimize for CI environments
+rustflags = ["-C", "target-cpu=native", "-C", "opt-level=2"]
 
-[profile.release]
-# Use safer release profile settings
-opt-level = 2                      # Safer optimization level
-codegen-units = 16                 # Multiple codegen units for stability
-lto = false                        # Disable LTO to avoid crashes
-panic = "abort"                    # Abort on panic for release builds
-strip = true                       # Strip debug symbols
-debug = false                      # No debug info in release builds
-
-[profile.dev]
-# Development profile settings
-opt-level = 0                      # No optimization for faster compilation
-debug = true                       # Include debug info
-codegen-units = 16                 # Multiple codegen units
-lto = false                        # Disable LTO
-
-# Environment-specific overrides
-[env]
-# Set environment variables for safer builds
-RUSTFLAGS = "--cfg debug_assertions"
-CARGO_INCREMENTAL = "1"
+[profile.ci]
+# CI-specific profile for memory-constrained environments
+opt-level = 2
+lto = false
+codegen-units = 4
+debug = false

Cargo.toml

@@ -76,6 +76,14 @@ opt-level = 3
 lto = true
 codegen-units = 1
 
+# CI-friendly profile for memory-constrained environments
+[profile.ci]
+inherits = "release"
+opt-level = 2
+lto = false
+codegen-units = 4
+debug = false
+
 [profile.dev]
 opt-level = 0
 debug = true

build-ci.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+set -e
+
+echo "🔧 Building apt-ostree for CI environment..."
+
+# Set memory-friendly environment variables
+export CARGO_BUILD_JOBS=2
+export RUSTFLAGS="-C target-cpu=native -C opt-level=2"
+export CARGO_TARGET_DIR="target-ci"
+
+# Clean previous builds
+echo "🧹 Cleaning previous builds..."
+cargo clean
+
+# Build with CI profile
+echo "🏗️ Building with CI profile..."
+cargo build --profile ci --bin apt-ostree
+cargo build --profile ci --bin apt-ostreed
+
+echo "✅ CI build completed successfully!"