Dockerfile: Fixed the 'ENTRYPOINT' as it needed the ./ prefix

Also added entry to the CHANGELOG and updated the README with this new feature

CHANGELOG.md

@@ -4,6 +4,8 @@
 
 - New flag `--description-file` to generate a description file of the Graph Nodes
   ([Issue #178](https://github.com/cycloidio/inframap/issues/178))
+- `graphviz` is now in the Docker image so no need of external tools to generate the graph by @agalazis
+  ([PR #221](https://github.com/cycloidio/inframap/pull/221))
 
 ### Changed
 

Dockerfile

@@ -12,7 +12,7 @@ RUN apk -q --no-progress add git make \
 
 FROM alpine
 
-RUN apk -q --no-progress add graphviz ttf-dejavu\
+RUN apk -q --no-progress add graphviz ttf-dejavu \
         && addgroup -g 1000 inframap \
         && adduser -u 1000 -G inframap -s /bin/ash -D inframap
 
@@ -22,4 +22,4 @@ WORKDIR /home/inframap
 
 COPY --from=builder /app/inframap /home/inframap
 
-ENTRYPOINT ["inframap"]
+ENTRYPOINT ["./inframap"]

README.md

@@ -81,33 +81,41 @@ The most important subcommands are:
 Visualizing with [dot](https://graphviz.org/download/)
 
 ```shell
-$ inframap generate state.tfstate | dot -Tpng > graph.png
+inframap generate state.tfstate | dot -Tpng > graph.png
 ```
 
 or from the terminal itself with [graph-easy](https://github.com/ironcamel/Graph-Easy)
 
 ```shell
-$ inframap generate state.tfstate | graph-easy
+inframap generate state.tfstate | graph-easy
 ```
 
 or from HCL
 
 ```shell
-$ inframap generate config.tf | graph-easy
+inframap generate config.tf | graph-easy
 ```
 
 or HCL module
 
 ```shell
-$ inframap generate ./my-module/ | graph-easy
+inframap generate ./my-module/ | graph-easy
 ```
 
 using docker image (assuming that your Terraform files are in the working directory)
 
 ```shell
-$ docker run --rm -v ${PWD}:/opt cycloid/inframap generate /opt/terraform.tfstate
+docker run --rm -v ${PWD}:/opt cycloid/inframap generate /opt/terraform.tfstate
 ```
 
+or if you use docker and want to have the images generated already, the docker image has the `graphviz` lib installed:
+
+```shell
+docker run --rm -v ${PWD}:/opt --entrypoint "/bin/ash" inframap -c './inframap generate /opt/PATH_TO_HCL_STATE | dot -Tpng > /opt/graph.png'
+```
+
+and the generated image will be on `$PWD/graph.png`
+
 
 **Note:** InfraMap will guess the type of the input (HCL or TFState) by validating if it's a JSON and if it fails then we fallback
 to HCL (except if you send a directory on args, the it'll use HCL directly), to force one specific type you can use `--hcl` or `--tfstate` flags.