Remove Linux ARM64 from CLI install and README (#1718)

* Remove Linux ARM64 support (not currently available)

- Update README platform table: remove Linux ARM64
- Update install.sh: reject Linux ARM64 with clear error message

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Fix README command tree: role assign→create, add fs cp command

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Update verbose/debug descriptions, add debug warning to tips

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: Annaji Sharma Ganti <Annaji.Ganti+microsoft@microsoft.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: 3 people

docs/early/aca-cli/README.md

@@ -49,7 +49,7 @@ curl -fsSL https://raw.githubusercontent.com/microsoft/azure-container-apps/main
 
 | Platform | Architecture |
 |----------|-------------|
-| Linux    | x64, ARM64  |
+| Linux    | x64         |
 | macOS    | ARM64       |
 | Windows  | x64         |
 
@@ -182,6 +182,9 @@ aca sandbox fs cat --id <id> --path /etc/os-release
 
 # Upload a local file
 aca sandbox fs write --id <id> --path /tmp/myfile.txt --file ./local-file.txt
+
+# Copy files between local machine and sandbox
+aca sandbox fs cp --id <id> --src ./local-dir --dest /app/
 ```
 
 ### Port Management
@@ -604,8 +607,8 @@ Every command accepts these flags:
 | `--group` | | Sandbox group (on sandbox subcommands) |
 | `--region` | | Data plane region |
 | `--output` | `-o` | Output format: `table` (default), `json` |
-| `--verbose` | | Verbose logging |
-| `--debug` | | Debug logging |
+| `--verbose` | | Enable verbose output (HTTP traces and resolved config) |
+| `--debug` | | Enable debug output (verbose + transport-level details) |
 | `--managed-identity` | | Use managed identity auth |
 | `--help` | `-h` | Show help |
 
@@ -651,6 +654,7 @@ aca sandbox list -o json | jq '.[].id'
 | Removing non-existent port | Fails with 404 |
 | `--sandbox-group` vs `--group` | Top-level commands use `--sandbox-group`; sandbox subcommands use `--group` |
 | MI role grant immediately after identity assign | May fail with 400 — **wait a few seconds** for propagation |
+| `--debug` flag | May log sensitive data (tokens, headers) — **do not share output without review** |
 
 ### Available Roles
 
@@ -717,7 +721,7 @@ aca
 │   │   └── remove                    Remove managed identity
 │   └── role
 │       ├── list                      List available roles
-│       └── assign                    Assign a role
+│       └── create                    Create a role assignment
 ├── sandbox
 │   ├── create                        Create a sandbox
 │   ├── list                          List sandboxes
@@ -755,7 +759,8 @@ aca
 │       ├── write                     Write a file into sandbox
 │       ├── rm                        Delete a file or directory
 │       ├── mkdir                     Create a directory
-│       └── stat                      Show file metadata
+│       ├── stat                      Show file metadata
+│       └── cp                        Copy files between local and sandbox
 ├── version                           Show CLI version
 └── doctor                            Check system prerequisites
 ```

docs/early/aca-cli/install.sh

@@ -25,7 +25,11 @@ detect_platform() {
                 echo "Error: macOS x64 (Intel) is not supported. Only macOS ARM64 (Apple Silicon) is available."; exit 1
             fi
             ARCH_TAG="x64" ;;
-        aarch64|arm64) ARCH_TAG="arm64" ;;
+        aarch64|arm64)
+            if [ "$OS_TAG" = "linux" ]; then
+                echo "Error: Linux ARM64 is not currently supported. Only Linux x64 is available."; exit 1
+            fi
+            ARCH_TAG="arm64" ;;
         *)             echo "Error: Unsupported architecture: $ARCH"; exit 1 ;;
     esac