Add CondaPkg.toml and specify channels for packages

Author: hwpang

CondaPkg.toml

@@ -0,0 +1 @@
+channels = ["defaults", "mjohnson541", "rmg", "conda-forge", "cantera"]

deps/build.jl

@@ -2,17 +2,14 @@ using CondaPkg
 using PythonCall
 packages = keys(CondaPkg.current_packages())
 if !("rmg" in packages) && !("rmgmolecule" in packages)
-    CondaPkg.add_channel("defaults")
-    CondaPkg.add_channel("conda-forge")
-    CondaPkg.add_channel("mjohnson541")
 
     if !(v"3.7" <= PythonCall.C.python_version() && PythonCall.C.python_version() <= v"3.9")
         CondaPkg.add("python"; version="3.9")
     end
-    CondaPkg.add("rmgmolecule"; version=">=0.3.0")
-    CondaPkg.add("matplotlib")
-    CondaPkg.add("rdkit")
-    CondaPkg.add("pydot")
+    CondaPkg.add("rmgmolecule"; version=">=0.3.0", channel="mjohnson541")
+    CondaPkg.add("matplotlib", channel="conda-forge")
+    CondaPkg.add("rdkit", channel="conda-forge")
+    CondaPkg.add("pydot", channel="conda-forge")
 end
 
 const Pkg = Base.require(Base.PkgId(Base.UUID("44cfe95a-1eb2-52ea-b672-e2afdf69b78f"), "Pkg"))