feat: update version to 0.6.9 and add packaging for Linux and BSD

- Bump version from 0.6.8 to 0.6.9 in Cargo.toml and Cargo.lock.
- Enhance GitHub Actions workflow to build and publish .deb, .rpm, and Snap packages.
- Implement AUR publishing for both dcr and dcr-bin packages.
- Add support for workspace-only projects in the build system.
- Introduce new `workspace` flag for build and run commands.
- Create snapcraft.yaml for Snap package configuration.
- Update build.rs and related files to handle workspace members and inheritance.
- Modify config handling to support optional package and build configurations.

src/cli/flags.rs

@@ -21,6 +21,7 @@ use crate::utils::log::warn;
 pub struct BuildRunFlags {
     pub profile: String,
     pub target: Option<String>,
+    pub workspace: Option<String>,
     pub force: bool,
     pub clean: bool,
     pub verbose: bool,
@@ -29,6 +30,7 @@ pub struct BuildRunFlags {
 pub fn parse_build_run_flags(args: &[String]) -> Result<BuildRunFlags, i32> {
     let mut profile = PROFILE.to_string();
     let mut target = None;
+    let mut workspace = None;
     let mut force = false;
     let mut clean = false;
     let mut verbose = false;
@@ -52,6 +54,15 @@ pub fn parse_build_run_flags(args: &[String]) -> Result<BuildRunFlags, i32> {
             verbose = true;
             continue;
         }
+        if candidate == "workspace" {
+            if let Some(w) = iter.next() {
+                workspace = Some(w.clone());
+            } else {
+                warn("--workspace requires a value");
+                return Err(1);
+            }
+            continue;
+        }
         if candidate == "target" {
             if let Some(t) = iter.next() {
                 target = Some(t.clone());
@@ -76,6 +87,7 @@ pub fn parse_build_run_flags(args: &[String]) -> Result<BuildRunFlags, i32> {
     Ok(BuildRunFlags {
         profile,
         target,
+        workspace,
         force,
         clean,
         verbose,