add workflow to upload new tag to Anaconda

[prjemian]

Build a conda package and upload to anaconda.org when a new tag is pushed. See: prjemian/ym2021_prj#8

[prjemian]

How to build for py3.7? This is building for py3.9.

[prjemian]

This does not get the job done:

apstools/.github/workflows/publish-anaconda.yml

Lines 31 to 32 in 43fb41a

	test_pyver: "3.7"
	test_npver: "1.18"

[prjemian]

Here is the last time this workflow completed successfully: https://github.com/BCDA-APS/apstools/actions/runs/1498195470

[prjemian]

• working commit hash: 5c05aed
• recent commit hash: 43fb41a

StackOverflow explains how to compare two commits of the same file. More details are provided by GitHub. With three dots:

https://github.com/<organization>/<repo_name>/compare/<commit1>...<commit2>

With two dots

https://github.com/<organization>/<repo_name>/compare/<commit1>..<commit2>

[prjemian]

Such as: https://github.com/BCDA-APS/apstools/compare/5c05aed..43fb41a

[prjemian]

Setting python version here was successful:

apstools/conda/meta.yaml

Line 36 in 35b05ba

- python >=3.7,<3.8