Update badges documentation

src/doc/src/guide/continuous-integration.md

@@ -49,6 +49,40 @@ breakage in nightly will not fail your overall build. Please see the
 [GitLab CI](https://docs.gitlab.com/ce/ci/yaml/README.html) for more
 information.
 
+### GitHub Actions
+
+To test your package on GitHub Actions, here is a sample `workflow.yml` file, which has to be in the directory `.github/workflows`:
+```yaml
+name: Rust
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Cache cargo registry
+      uses: actions/cache@v1
+      with:
+        path: ~/.cargo/registry
+        key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
+    - name: Cache cargo build
+      uses: actions/cache@v1
+      with:
+        path: target
+        key: ${{ runner.os }}-cargo-build-target-${{ hashFiles('**/Cargo.lock') }}
+
+    - name: Build
+      run: cargo build --verbose
+    - name: Run tests
+      run: cargo test --verbose
+```
+This will run on a push to the repository. Pleas see the [GitHub Actions help](https://help.github.com/en/actions) for more information.
+
 ### builds.sr.ht
 
 To test your package on sr.ht, here is a sample `.build.yml` file.

src/doc/src/reference/manifest.md

@@ -433,59 +433,11 @@ default-run = "a"
 
 ### The `[badges]` section
 
-[crates.io] can display various badges for build status, test coverage, etc. for
-each crate. All badges are optional.
-
-- The badges pertaining to build status that are currently available are
-  Appveyor, CircleCI, Cirrus CI, GitLab, Azure DevOps, Travis CI and Bitbucket
-  Pipelines.
-- Available badges pertaining to code test coverage are Codecov and Coveralls.
-- There are also maintenance-related badges based on isitmaintained.com
-  which state the issue resolution time, percent of open issues, and future
-  maintenance intentions.
-
-Most badge specifications require a `repository` key. It is expected to be in
-`user/repo` format.
+[crates.io] does not display various badges for build status, test coverage, etc. for
+each crate any more. Only the following fields will be shown.
 
 ```toml
 [badges]
-
-# Appveyor: `repository` is required. `branch` is optional; default is `master`
-# `service` is optional; valid values are `github` (default), `bitbucket`, and
-# `gitlab`; `id` is optional; you can specify the appveyor project id if you
-# want to use that instead. `project_name` is optional; use when the repository
-# name differs from the appveyor project name.
-appveyor = { repository = "...", branch = "master", service = "github" }
-
-# Circle CI: `repository` is required. `branch` is optional; default is `master`
-circle-ci = { repository = "...", branch = "master" }
-
-# Cirrus CI: `repository` is required. `branch` is optional; default is `master`
-cirrus-ci = { repository = "...", branch = "master" }
-
-# GitLab: `repository` is required. `branch` is optional; default is `master`
-gitlab = { repository = "...", branch = "master" }
-
-# Azure DevOps: `project` is required. `pipeline` is required. `build` is optional; default is `1`
-# Note: project = `organization/project`, pipeline = `name_of_pipeline`, build = `definitionId`
-azure-devops = { project = "...", pipeline = "...", build="2" }
-
-# Travis CI: `repository` in format "<user>/<project>" is required.
-# `branch` is optional; default is `master`
-travis-ci = { repository = "...", branch = "master" }
-
-# Bitbucket Pipelines: `repository` is required. `branch` is required
-bitbucket-pipelines = { repository = "...", branch = "master" }
-
-# Codecov: `repository` is required. `branch` is optional; default is `master`
-# `service` is optional; valid values are `github` (default), `bitbucket`, and
-# `gitlab`.
-codecov = { repository = "...", branch = "master", service = "github" }
-
-# Coveralls: `repository` is required. `branch` is optional; default is `master`
-# `service` is optional; valid values are `github` (default) and `bitbucket`.
-coveralls = { repository = "...", branch = "master", service = "github" }
-
 # Is it maintained resolution time: `repository` is required.
 is-it-maintained-issue-resolution = { repository = "..." }