Some environment variables may not be defined inside files

Fixes #102

Author: aalmiray

docs/modules/tools/pages/jreleaser-ant.adoc

@@ -59,6 +59,9 @@ These additional environment variables are supported as well:
 | JRELEASER_NO_COLOR   | disable colors in output
 |===
 
+WARNING: These environment variables cannot be defined in `.env` files nor any other input files supported by
+xref:reference:environment.adoc[].
+
 == Filtering Artifacts
 
 Many commands let you filter (include or exclude) artifacts using a combination of target properties or environment variables.

docs/modules/tools/pages/jreleaser-cli.adoc

@@ -72,6 +72,9 @@ These additional environment variables are supported as well:
 | JRELEASER_NO_COLOR   | disable colors in output
 |===
 
+WARNING: These environment variables cannot be defined in `.env` files nor any other input files supported by
+xref:reference:environment.adoc[].
+
 == Filtering Artifacts
 
 Many commands let you filter (include or exclude) artifacts using a combination of command flags or environment variables.

docs/modules/tools/pages/jreleaser-gradle.adoc

@@ -54,6 +54,9 @@ These additional environment variables are supported as well:
 | JRELEASER_NO_COLOR   | disable colors in output
 |===
 
+WARNING: These environment variables cannot be defined in `.env` files nor any other input files supported by
+xref:reference:environment.adoc[].
+
 == Filtering Artifacts
 
 Many commands let you filter (include or exclude) artifacts using a combination of task flags or environment variables.

docs/modules/tools/pages/jreleaser-maven.adoc

@@ -87,6 +87,9 @@ These additional environment variables are supported as well:
 | JRELEASER_NO_COLOR   | disable colors in output
 |===
 
+WARNING: These environment variables cannot be defined in `.env` files nor any other input files supported by
+xref:reference:environment.adoc[].
+
 == Filtering Artifacts
 
 Many commands let you filter (include or exclude) artifacts using a combination of properties or environment variables.