[igt-dev] [PATCH i-g-t] README: Mention Dockerfiles with dependencies by name

[Arkadiusz Hiler]

Debian has two Dockerfiles associated - minimal and regular one that
bases on the minimal one.

Let's mention them by name and add a comment providing some context to
the split so it's easier to figure out what to install on a new system.

Signed-off-by: Arkadiusz Hiler <arkadiusz.hiler at intel.com>
---
 Dockerfile.build-debian | 5 +++++
 README.md               | 4 ++--
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/Dockerfile.build-debian b/Dockerfile.build-debian
index 69f63157..36c51765 100644
--- a/Dockerfile.build-debian
+++ b/Dockerfile.build-debian
@@ -2,6 +2,11 @@ ARG CI_COMMIT_SHA
 ARG CI_REGISTRY_IMAGE
 FROM $CI_REGISTRY_IMAGE/build-debian-minimal:commit-$CI_COMMIT_SHA
 
+# inherits from Dockerfile.build-debian-minimal
+#
+# just few extra dependencies for building IGT with all the optional components
+# enabled
+
 RUN apt-get update
 RUN apt-get install -y \
 			libunwind-dev \
diff --git a/README.md b/README.md
index a6a821c0..f33e9455 100644
--- a/README.md
+++ b/README.md
@@ -20,8 +20,8 @@ Generated documentation for the latest master is published under
 Requirements
 ------------
 
-See `Dockerfile.*` for up-to-date list of package names in Fedora and
-Debian.
+See `Dockerfile.build-fedora` for up-to-date list of package names in Fedora
+or `Dockerfile.build-debian-minimal` and `Dockerfile.build-debian` for Debian.
 
 If your distribution packages IGT you can also use your package manager to
 install the dependencies, e.g.:
-- 
2.21.0