f: Rebuild fresh binary for release

Author: arik-so

.github/workflows/swift.yml

@@ -61,6 +61,19 @@ jobs:
                     LDK_C_BINDINGS_BASE: ${{ github.workspace }}/ci/ldk-c-bindings
                     H_FILE_OUTPUT_DIRECTORY: ${{ github.workspace }}/ci/LDKSwift/Sources/LDKHeaders/include
                     C_FILE_OUTPUT_DIRECTORY: ${{ github.workspace }}/ci/LDKSwift/Sources/LDKHeaders
+            -   name: Prepare rust binaries
+                run: |
+                    env
+                    pushd ${{ github.workspace }}/ci/ldk-c-bindings/lightning-c-bindings
+                    cargo clean
+                    cargo build --release --features std
+
+                    # debug the target
+                    find ./target
+                env:
+                    RUST_BACKTRACE: 1
+                    RUSTFLAGS: --cfg=c_bindings -C embed-bitcode=yes -C lto
+                    CARGO_PROFILE_RELEASE_LTO: true
             -   name: Install Swift Toolchain
                 run: |
                     curl --verbose -L -o swift-5.7.2-RELEASE-ubuntu22.04.tar.gz https://download.swift.org/swift-5.7.2-release/ubuntu2204/swift-5.7.2-RELEASE/swift-5.7.2-RELEASE-ubuntu22.04.tar.gz
@@ -94,15 +107,6 @@ jobs:
             -   name: Verify generated output recency
                 run: |
                     git diff --exit-code out/ ':(exclude)out/VersionDescriptor.swift'
-            -   name: Prepare rust binaries
-                run: |
-                    env
-                    pushd ${{ github.workspace }}/ci/ldk-c-bindings/lightning-c-bindings
-                    cargo clean
-                    cargo build --release --features std
-
-                    # debug the target
-                    find ./target
             -   name: Build Swift bindings package without address sanitizer
                 run: |
                     env