feat(action): add initial version of Github action

Dockerfile

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+FROM continuumio/miniconda3:4.5.12
+
+LABEL "com.github.actions.name"="Publish Anaconda Package"
+LABEL "com.github.actions.description"="Package and publish Anaconda modules."
+LABEL "com.github.actions.icon"="package"
+LABEL "com.github.actions.color"="purple"
+
+LABEL "repository"="https://github.com/m0nhawk/conda-package-publish-action"
+LABEL "maintainer"="Andrew Prokhorenkov <[email protected]>"
+
+RUN conda install anaconda-client conda-build
+
+ADD entrypoint.sh /entrypoint.sh
+ENTRYPOINT ["/entrypoint.sh"]

README.md

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+# Publish Anacond Package
+A Github Action to publish your Python package to Anaconda repository.
+
+## Use
+Doesn't take any arguments.
+
+### Environment Variables/Secrets
+- Login credentials for the package repo:
+    - `ANACONDA_USERNAME`=`foo`
+    - `ANACONDA_PASSWORD`=`bar`
+    etc.  
+- `SUBDIR` (optional): if your `setup.py` and `meta.yaml` is in a subdirectory of your repo. This will just change the working directory to the `SUBDIR` before running the rest of the script.
+
+### Example workflow
+```hcl
+workflow "Publish" {
+  resolves = ["publish-to-conda"]
+  on = "release"
+}
+
+action "publish-to-conda" {
+  uses = "m0nhawk/conda-package-publish-action@master"
+  secrets = ["ANACONDA_USERNAME", "ANACONDA_PASSWORD"]
+}
+```

entrypoint.sh

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+#!/bin/bash
+
+set -ex
+set -o pipefail
+
+go_to_build_dir() {
+	if [ ! -z $SUBDIR ]; then
+		cd $SUBDIR
+	fi
+}
+
+check_if_setup_file_exists() {
+	if [ ! -f setup.py ]; then
+		echo "setup.py must exist in the directory that is being packaged and published."
+		exit 1
+	fi
+}
+
+check_if_meta_yaml_file_exists() {
+    if [ ! -f meta.yaml ]; then
+		echo "meta.yaml must exist in the directory that is being packaged and published."
+		exit 1
+	fi
+}
+
+upload_package(){
+    conda config --set anaconda_upload yes
+    anaconda login --username $ANACONDA_USERNAME --password $ANACONDA_PASSWORD
+    conda build .
+    anaconda logout
+}
+
+go_to_build_dir
+check_if_setup_file_exists
+check_if_meta_yaml_file_exists
+upload_package