Add instructions for macOS.

gitea/README.md

@@ -25,3 +25,8 @@ GITEA__log__LEVEL=TRACE
 ```
 to the `server` definition in `docker-compose.yml` and re-start.
 Details on how to setup remote debugging of the gitea server inside its container can be found [here](gitea-debugging.md).
+
+#### Action Runners
+
+A Dockerized action runner for the `ubuntu-latest` and `ubuntu-22.04` labels is deployed by default.  Details on deploying native
+action runners, eg, on macOS, can be found [here](act-runner.md).

gitea/act-runner.md

@@ -0,0 +1,67 @@
+## Deploying Action Runners
+
+### Releases
+Gitea publishes binary releases of [gitea/act_runner](https://gitea.com/gitea/act_runner/releases) for many platform and architectures, which can be used to deploy new action runners simply.
+
+The following example uses `gitea/act_runner` 0.2.6 on macOS Ventura 13.3 x64.
+
+### Registration Token
+
+> Note: Runners can be registered globally for an entire Gitea instance, for a specific organization, or for a single repo.  This example assumes registering the runner globally.
+
+Before executing the runner, first obtain a registration token by visiting http://gitea.local:3000/admin/actions/runners, clicking the 'Create new Runner' button, and copying the displayed
+registration token, for example, `FTyMBkcK9ErmD0wm8LfBzfXOUUlQA7dBJF6BB64Z`.
+
+### Runner Registration and Startup
+
+After you have obtained a registration token, download the `gitea/act_runner` release matching your platform and architecture and run it as follows:
+
+```
+# Download latest gitea/act_runner release.
+$ wget https://gitea.com/gitea/act_runner/releases/download/latest/act_runner-0.2.6-darwin-amd64 && chmod a+x act_runner-0.2.6-darwin-amd64
+
+# Register the runner with the Gitea instance.
+$ ./act_runner-0.2.6-darwin-amd64 register \
+    --instance http://gitea.local:3000 \
+    --labels 'darwin-latest-amd64:host,darwin-13-amd64:host' \
+    --name 'darwin-amd64-001' \
+    --token "FTyMBkcK9ErmD0wm8LfBzfXOUUlQA7dBJF6BB64Z" \
+    --no-interactive
+
+# Launch it in daemon mode, waiting for jobs.
+$ ./act_runner-0.2.6-darwin-amd64 daemon
+```
+
+### Labels
+
+The most important detail in this example is the label.  For the Ubuntu runner which is deployed automatically with this project, the label `ubuntu-latest:docker://cerc/act-runner-task-executor:local` is
+used, which instructs `gitea/act_runner` that tasks should be executed inside an instance of the `cerc/act-runner-task-executor:local` Docker container.  In this example, the label is `darwin-latest-amd64:host`.
+This means that tasks will be executed directly on the host.  Since there are additional security implications when executing tasks on the host, only trusted repositories with strict access controls
+should be allowed to schedule CI jobs on the runner.
+
+### Example Workflow
+
+This very simple workflow will schedule jobs on both macOS (`darwin-latest-amd64`) and Linux (`ubuntu-latest`) runners.
+
+```
+name: macOS test
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  test-macos:
+    name: "Run on macOS"
+    runs-on: darwin-latest-amd64
+    steps:
+      - name: "uname"
+        run: uname -a
+  test-linux:
+    name: "Run on Ubuntu"
+    runs-on: ubuntu-latest
+    steps:
+      - name: "uname"
+        run: uname -a
+```

gitea/initialize-gitea.sh

@@ -8,7 +8,8 @@ fi
 
 # See: https://stackoverflow.com/a/74449556
 secure_password() {
-    cat /dev/urandom | tr -dc A-Za-z0-9~_- | head -c 10 && echo
+    # extra bytes so that even if we delete some chars we will still have plenty
+    openssl rand -base64 32 | tr -d '\/+=' | head -c10 && echo
 }
 
 GITEA_USER=${CERC_GITEA_NEW_ADMIN_USERNAME:-"gitea_admin"}