Add nf-test sharding CI (#1668)

- **ci: Copy over from methylseq**
- **ci: Move Sarek specific settings to ci**
- **ci: tap => xml**

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## PR checklist

- [ ] This comment contains a description of changes (with reason).
- [ ] If you've fixed a bug or added code that should be tested, add
tests!
- [ ] If you've added a new tool - have you followed the pipeline
conventions in the [contribution
docs](https://github.com/nf-core/sarek/tree/master/.github/CONTRIBUTING.md)
- [ ] If necessary, also make a PR on the nf-core/sarek _branch_ on the
[nf-core/test-datasets](https://github.com/nf-core/test-datasets)
repository.
- [ ] Make sure your code lints (`nf-core lint`).
- [ ] Ensure the test suite passes (`nextflow run . -profile test,docker
--outdir <OUTDIR>`).
- [ ] Check for unexpected warnings in debug mode (`nextflow run .
-profile debug,test,docker --outdir <OUTDIR>`).
- [ ] Usage Documentation in `docs/usage.md` is updated.
- [ ] Output Documentation in `docs/output.md` is updated.
- [ ] `CHANGELOG.md` is updated.
- [ ] `README.md` is updated (including new tool citations and
authors/contributors).

---------

Co-authored-by: Maxime U Garcia <[email protected]>

.github/nf-test-tags.yml

@@ -0,0 +1,50 @@
+exclude:
+  - tags: "bcftools/annotate"
+  - tags: "bcftools/concat"
+  - tags: "bcftools/mpileup"
+  - tags: "bcftools/sort"
+  - tags: "bwa/index"
+  - tags: "bwa/mem"
+  - tags: "bwamem2/index"
+  - tags: "bwamem2/mem"
+  - tags: "cat/cat"
+  - tags: "cat/fastq"
+  - tags: "cnvkit/antitarget"
+  - tags: "cnvkit/batch"
+  - tags: "cnvkit/reference"
+  - tags: "deepvariant"
+  - tags: "dragmap/align"
+  - tags: "dragmap/hashtable"
+  - tags: "ensemblvep/download"
+  - tags: "ensemblvep/vep"
+  - tags: "fastp"
+  - tags: "fastqc"
+  - tags: "fgbio/fastqtobam"
+  - tags: "freebayes"
+  - tags: "gatk4/applybqsr"
+  - tags: "gatk4/baserecalibrator"
+  - tags: "gatk4/estimatelibrarycomplexity"
+  - tags: "gatk4/genomicsdbimport"
+  - tags: "gatk4/haplotypecaller"
+  - tags: "gatk4/markduplicates"
+  - tags: "gatk4/mergevcfs"
+  - tags: "gatk4/mutect2"
+  - tags: "gatk4spark/applybqsr"
+  - tags: "gatk4spark/markduplicates"
+  - tags: "gawk"
+  - tags: "lofreq/callparallel"
+  - tags: "mosdepth"
+  - tags: "multiqc"
+  - tags: "ngscheckmate/ncm"
+  - tags: "samblaster"
+  - tags: "samtools/convert"
+  - tags: "samtools/mpileup"
+  - tags: "samtools/stats"
+  - tags: "snpeff/snpeff"
+  - tags: "strelka/germline"
+  - tags: "strelka/somatic"
+  - tags: "subworkflows/utils_nfvalidation_plugin"
+  - tags: "tabix/bgziptabix"
+  - tags: "tabix/tabix"
+  - tags: "tiddit/sv"
+  - tags: "untar"