Default to conda-forge

.github/workflows/test.yml

@@ -26,6 +26,8 @@ jobs:
         with:
           environment-file: false
 
+      - run: micromamba info
+
       - name: install mamba
         uses: ./
 

.github/workflows/test_options.yml

@@ -32,6 +32,10 @@ jobs:
           environment-file: false
           environment-name: nofile
 
+      - run: |
+          micromamba info | grep -q nofile
+          micromamba info | grep -q conda-forge
+
       - name: install mamba
         uses: ./
         with:

README.md

@@ -46,7 +46,7 @@ are available.
 
 ### `channels`
 
-Comma separated list of channels to use in order of priority (eg., `conda-forge,my-private-channel`)
+Comma separated list of channels to use in order of priority (eg., `conda-forge,my-private-channel`). This defaults to `conda-forge` if only `environment-file` is `false` and no `condarc-file` is given and there is no `channels` key in `condarc-opts`.
 
 ### `condarc-file`
 

action.yml

@@ -44,7 +44,8 @@ inputs:
       are available.
   channels:
     description: >-
-      Comma separated list of channels to use in order of priority (eg., `conda-forge,my-private-channel`)
+      Comma separated list of channels to use in order of priority (eg., `conda-forge,my-private-channel`).
+      This defaults to `conda-forge` if only `environment-file` is `false` and no `condarc-file` is given and there is no `channels` key in `condarc-opts`.
   condarc-file:
     description: >-
       Path to a `.condarc` file to use. See the [Conda documentation](https://docs.conda.io/projects/conda/en/latest/user-guide/configuration/)