docs: update container registry agent environment variables

README.md

@@ -311,7 +311,11 @@ are mandatory to configure the Broker client:
 - `BROKER_TOKEN` - The Snyk Broker token, obtained from your Container registry integration settings (app.snyk.io).
 - `BROKER_CLIENT_URL` - The URL of your broker client (including scheme and - port) used by container registry agent to call back to Snyk.
 - `CR_AGENT_URL` - The URL of your container registry agent (including scheme and - port) to which brokered requests would be forwarded.
-- `CR_CREDENTIALS` - Base64-encoded credentials json used by agent to access container registry.
+- `CR_TYPE` - The container registry type as listed in supporter registries, for example "DockerHub", "GoogleCR", "ArtifactoryCR".
+- `CR_BASE` - The hostname of the container registry api to connect to, for example: "cr.host.com".
+- `CR_USERNAME` - The username for authenticating to container registry api. Not used for DigitalOcean container registry.
+- `CR_PASSWORD` - The password for authenticating to container registry api. Not used for DigitalOcean container registry.
+- `CR_TOKEN` - Authentication token for DigitalOcean container registry.
 - `PORT` - The local port at which the Broker client accepts connections. Default is 7341.
 
 #### Command-line arguments
@@ -324,7 +328,10 @@ docker run --restart=always \
            -e BROKER_TOKEN=secret-broker-token \
            -e BROKER_CLIENT_URL=https://my.broker.client:8000 \
            -e CR_AGENT_URL=https://my.container.registry.agent \
-           -e CR_CREDENTIALS=base64-encoded-credentials-json \
+           -e CR_TYPE=container-registry-type \
+           -e CR_BASE=your.container.registry.domain.com \
+           -e CR_USERNAME=secret-container-registry-username \
+           -e CR_PASSWORD=secret-container-registry-password \
            -e PORT=8000 \
        snyk/broker:container-registry-agent
 ```
@@ -339,7 +346,10 @@ FROM snyk/broker:container-registry-agent
 ENV BROKER_TOKEN          secret-broker-token
 ENV BROKER_CLIENT_URL     https://my.broker.client:8000
 ENV CR_AGENT_URL          https://my.container.registry.agent
-ENV CR_CREDENTIALS        base64-encoded-credentials-json
+ENV CR_TYPE               container-registry-type
+ENV CR_BASE               your.container.registry.domain.com
+ENV CR_USERNAME           secret-container-registry-username
+ENV CR_PASSWORD           secret-container-registry-password
 ENV PORT                  8000
 ```