[docker/cli] The new `docker images' output format is pretty unusable

### ROOT CAUSE The issue stems from Docker changing the default output format of the `docker images` command, which breaks legacy code relying on the previous table format. Additionally, image names are now truncated by default, requiring the `--no-trunc` flag for readability, adding inconvenience. ### CODE FIX To address these concerns, we can introduce a new configuration option to revert the output format to the traditional table and prevent image truncation by default. **Step-by-Step Explanation:** 1. **Introduce a Configuration Flag:** - Create a new environment variable `DOCKER_TABLE_OUTPUT` which, when set to `true`, switches `docker images` to the table format. 2. **Modify Output Logic:** - Update the `docker images` command to check the `DOCKER_TABLE_OUTPUT` environment variable. If set, use the table format; otherwise, use the JSON-like format. 3. **Prevent Image Truncation by Default:** - Change the default behavior of `docker images` to not truncate image names unless explicitly specified with a new flag (e.g., `--trunc`). **Proposed Code Changes:** 1. **Add Environment Variable Check:** - In the Docker CLI, modify the `images` command to read the `DOCKER_TABLE_OUTPUT` variable.

bash
   if [ "$DOCKER_TABLE_OUTPUT" = "true" ]; then
       # Output in table format
       docker image ls --format "table"
   else
       # Use the current JSON-like output
       docker image ls
   fi
   


2. **Modify Docker Configuration:**
   - Update Docker's configuration to support the new environment variable and flag.

   
dockerfile
   ENV DOCKER_TABLE_OUTPUT=false
   


3. **Introduce `--no-trunc` as Default:**
   - Change the default behavior of `docker images` to not truncate image names.

   
bash
   # By default, image names are not truncated
   docker images --no-trunc
   


**Implementation:**

- **Docker CLI Update:**
  - Edit the `docker images` command logic to respect the `DOCKER_TABLE_OUTPUT` variable and default to `--no-trunc`.

- **User Instructions:**
  - Users can set `export DOCKER_TABLE_OUTPUT=true` to revert to the table format.
  - Image names will remain untruncated by default unless the `--trunc` flag is used.

**Summary:**
By introducing a configuration flag and adjusting the default behavior, Docker can maintain backward compatibility while allowing flexibility for new use cases. This solution respects legacy systems and improves the default user experience.