add training materials from NE BRR 2023 docker training

.gitpod.yml

@@ -10,7 +10,7 @@ tasks:
       pip install graphviz
       . /opt/conda/etc/profile.d/conda.sh
       conda activate base
-      git checkout main
+      git checkout master
 vscode:
   extensions: # based on nf-core.nf-core-extensionpack
     - codezombiech.gitignore                 # Language support for .gitignore files

README.md

@@ -90,6 +90,10 @@ singularity exec --bind $(pwd)/fastq:/data staphb-bbtools-38.96.simg bbduk.sh in
 
 Further documentation can be found at [docs.sylabs.io](https://docs.sylabs.io/guides/3.1/user-guide/cli.html)
 
+## Training
+
+- Training materials (slides & exercises) from the North East Bioinformatics Regional Resource 2023 workshop **Docker for Public Health Bioinformatics** can be located here, within [`training/NE-BRR-docker-for-PH-bioinformatics-May2023/`](training/NE-BRR-docker-for-PH-bioinformatics-May2023/)
+
 ## Logs
 
 In November 2020, Docker began to implement pull rate limits for images hosted on dockerhub. This limits the number of `docker pull`'s per time period (e.g. anonymous users allowed 100 pulls per six hours). We applied and were approved for Docker's "Open Source Program," which should have removed the pull rate limits for all `staphb` docker images! 🎉 🥳 If you encounter an error such as `ERROR: toomanyrequests: Too Many Requests.` or `You have reached your pull rate limit. You may increase the limit by authenticating and upgrading: https://www.docker.com/increase-rate-limits.` , please let us know by [submitting an issue.](https://github.com/StaPH-B/docker-builds/issues)