Use ftpmirror.gnu.org whenever applicable

Signed-off-by: Sergio Durigan Junior <[email protected]>

Author: sergiodj

examples/conditional.yaml

@@ -44,7 +44,7 @@ pipeline:
   - uses: fetch
     if: ${{package.name}} != 'hello'
     with:
-      uri: https://ftp.gnu.org/gnu/hello/hello-${{package.version}}.tar.gz
+      uri: https://ftpmirror.gnu.org/gnu/hello/hello-${{package.version}}.tar.gz
       expected-sha256: cf04af86dc085268c5f4470fbae49b18afbc221b78096aab842d934a76bad0ab
 
   - runs: |

examples/gnu-hello.yaml

@@ -25,7 +25,7 @@ environment:
 pipeline:
   - uses: fetch
     with:
-      uri: https://ftp.gnu.org/gnu/hello/hello-${{package.version}}.tar.gz
+      uri: https://ftpmirror.gnu.org/gnu/hello/hello-${{package.version}}.tar.gz
       expected-sha256: cf04af86dc085268c5f4470fbae49b18afbc221b78096aab842d934a76bad0ab
 
   - uses: autoconf/configure