Add Dockerfile to provide Postgres with PgDD extension.

Author: rustprooflabs

.dockerignore

@@ -0,0 +1,2 @@
+.git
+Dockerfile*

Dockerfile

@@ -0,0 +1,20 @@
+FROM postgres:12
+
+ENV PG_MAJOR 12
+
+LABEL maintainer="PgDD Project - https://github.com/rustprooflabs/pgdd"
+
+RUN apt-get update \
+    && apt-cache showpkg postgresql-$PG_MAJOR \
+    && apt-get install -y --no-install-recommends \
+        make \
+        postgresql-server-dev-$PG_MAJOR \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /tmp/pgdd
+COPY *.sql ./
+COPY pgdd.control ./
+COPY Makefile ./
+
+RUN make install
+

README.md

@@ -4,6 +4,14 @@ The PostgreSQL Data Dictionary (`pgdd`) is an in-database solution to provide
 introspection via standard SQL query syntax.  This extension makes  it easy to
 provide a usable data dictionary to all users of a PostgreSQL database.
 
+## Compatability
+
+PgDD has been tested and found to work against PostgreSQL 10
+through 13-beta2.
+
+Docker images available on
+[Docker Hub](https://hub.docker.com/r/rustprooflabs/pgdd).
+
 
 ## Install `pgdd`
 
@@ -42,6 +50,32 @@ psql -d your_db
 CREATE EXTENSION pgdd;
 ```
 
+## Docker Image
+
+Build Docker image.  Uses [main Postgres image](https://hub.docker.com/_/postgres/) as starting point, see that
+repo for full instructions on using the core Postgres functionality.
+
+```
+docker build -t rustprooflabs/pgdd .
+```
+
+Build with tag.
+
+Run Postgres in Docker.
+
+```
+docker run --name test-pgdd12 -e POSTGRES_PASSWORD=mysecretpassword -p 6512:5432 -d rustprooflabs/pgdd
+```
+
+Connect via `psql` using `postgres` role, provide password from prior step
+when prompted.
+
+```
+psql -h host_or_ip -p 6512 -U postgres 
+```
+
+
+
 ## Database Permissions
 
 Create Read-only group role to assign to users
@@ -82,6 +116,7 @@ GRANT dd_readwrite TO <your_login_user>;
 ```
 
 
+
 ## Use Data Dictionary
 
 Connect to your database using your favorite SQL client.  This