chore: removed mentions of travis

CONTRIBUTING.md

@@ -10,53 +10,14 @@ Your contributions such as reporting a bug and sending pull-request are very wel
 ## How to send pull-request
 
 1. Fork the repository: https://github.com/multiarch/qemu-user-static . Ex. https://github.com/junaruga/qemu-user-static
-2. This repository is using Travis CI. You can test your modified code on your forked repository before sending a pull-requeste. Go to https://travis-ci.org/your_account_name/qemu-user-static , then enable Travis. Ex. https://travis-ci.org/junaruga/qemu-user-static
+2. This repository is using Github Actions. You can test your modified code on your forked repository before sending a pull-requeste.
 3. If you want to test pushing created container images,
     * You need to have your own container repository such as DockerHub or Quay.io. Ex. https://quay.io/repository/junaruga/qemu-user-static
-    * You need to set environment variables `DOCKER_USERNAME` and `DOCKER_PASSWORD` on your repository's Travis CI Settings page. Please remember it is better to set `DOCKER_PASSWORD` without displaying the value for your security.
-  ![Forked repository's Travis CI Settings](docs/images/forked-repo-travis-ci-settings.png)
-
+    * You need to set environment variables `DOCKER_USERNAME` and `DOCKER_PASSWORD` on your repository's Settings page. Please remember it is better to set `DOCKER_PASSWORD` without displaying the value for your security.
 4. You also need to have your https://quay.io/repository/junaruga/qemu-user-static
-5. You need to edit `.travis.yml` with your container repository. This step can be improved in the future.
+5. You need to edit `.github/workflows/actions.yml` with your container repository. This step can be improved in the future.
 6. Below is an example of how to test with your container repository.
-
-```
-$ git diff
-diff --git a/.travis.yml b/.travis.yml
-index 79ca070..edee35e 100644
---- a/.travis.yml
-+++ b/.travis.yml
-@@ -15,13 +15,13 @@ env:
-         - VERSION=4.0.0-5
-         # See qemu-user-static's RPM spec file on Fedora to check the new version.
-         # https://src.fedoraproject.org/rpms/qemu/blob/master/f/qemu.spec
--        - DOCKER_SERVER=docker.io
--        # - DOCKER_SERVER=quay.io
-+        # - DOCKER_SERVER=docker.io
-+        - DOCKER_SERVER=quay.io
-         # Git repository
-         - REPO=multiarch/qemu-user-static
-         # Container repository
--        - DOCKER_REPO=$DOCKER_SERVER/multiarch/qemu-user-static
--        # - DOCKER_REPO=$DOCKER_SERVER/your_username/qemu-user-static
-+        # - DOCKER_REPO=$DOCKER_SERVER/multiarch/qemu-user-static
-+        - DOCKER_REPO=$DOCKER_SERVER/junaruga/qemu-user-static
- 
-         - PACKAGE_URI="https://kojipkgs.fedoraproject.org/packages/qemu/4.0.0/5.fc31/x86_64/qemu-user-static-4.0.0-5.fc31.x86_64.rpm"
-         - PACKAGE_FILENAME=$(basename "$PACKAGE_URI")
-@@ -39,7 +39,7 @@ script:
-     - ./test.sh -d "$DOCKER_REPO"
- after_success:
-     - |
--      if [[ $TRAVIS_BRANCH == 'master' && $TRAVIS_PULL_REQUEST == 'false' ]]; then
-+      # if [[ $TRAVIS_BRANCH == 'master' && $TRAVIS_PULL_REQUEST == 'false' ]]; then
-           docker login -u="$DOCKER_USERNAME" -p="$DOCKER_PASSWORD" "$DOCKER_SERVER" && \
-               docker push "$DOCKER_REPO"
--      fi
-+      # fi
-```
-
-7. Check Travis CI's log, and ensure the container images are created.
+7. Check Github Actions's log, and ensure the container images are created.
 8. You are ready to send the pull-request!
 
 ## References

README.md

@@ -44,8 +44,6 @@ $ docker run --rm -t ppc64le/busybox uname -m
 ppc64le
 ```
 
-For 32-bit container image, the result of `uname` can be the 64-bit's one. But it is 32-bit environment. Please see the [example](docs/examples.md) - junaruga/ci-multi-arch-test i386 case on Travis CI.
-
 ```
 $ docker run --rm -t i386/ubuntu uname -m
 x86_64

docs/developers_guide.md

@@ -80,9 +80,9 @@ binfmt_misc is a feature of kernel. A container uses the host OS's kernel.
 ## Programs input & output
 
 In this section, we describe a program's input and output.
-This repository is a pipeline system by using Travis CI.
+This repository is a pipeline system by using Github Actions.
 
-First, we describe the entire pipelne system's input and output. `.travis.yml` is the top level file.
+First, we describe the entire pipelne system's input and output. `.github/workflows/actions.yml` is the top level file.
 
 * Input of the pipeline: `qemu-user-static-X.Y.Z-R.fcNN.$arch.rpm` RPM file under [Fedora Project URL](https://kojipkgs.fedoraproject.org/packages/qemu). Right now `$arch` is only x86_64.
 * Output of the pipeline: