fix(ci): install OpenSSL for Linux builds in workflow and cross containers

- Add libssl-dev and pkg-config installation for all Ubuntu jobs
- Add Cross.toml with pre-build hooks to install OpenSSL in cross containers:
  - aarch64-unknown-linux-gnu: install libssl-dev:arm64 via dpkg
  - aarch64-unknown-linux-musl: install openssl-dev via apk (Alpine)
- Reverts vendored OpenSSL approach in favor of system packages

Author: pRizz

.github/workflows/build-cli-binaries.yml

@@ -52,9 +52,15 @@ jobs:
         if: ${{ matrix.use-cross == 'true' }}
         run: cargo install cross --version 0.2.5
 
+      - name: Install OpenSSL dev (for Linux targets)
+        if: matrix.os == 'ubuntu-latest'
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y libssl-dev pkg-config
+
       - name: Install musl-tools (for musl x64)
         if: matrix.target == 'x86_64-unknown-linux-musl'
-        run: sudo apt-get update && sudo apt-get install -y musl-tools
+        run: sudo apt-get install -y musl-tools
 
       - name: Rust cache
         uses: Swatinem/rust-cache@v2

Cross.toml

@@ -0,0 +1,12 @@
+# Cross configuration for OpenSSL support in cross-compilation containers
+
+[target.aarch64-unknown-linux-gnu]
+pre-build = [
+  "dpkg --add-architecture arm64",
+  "apt-get update && apt-get install --assume-yes -y libssl-dev:arm64 pkg-config"
+]
+
+[target.aarch64-unknown-linux-musl]
+pre-build = [
+  "apk add --no-cache openssl-dev"
+]