Initial: flux-deploy composite action for K8s GitOps deployments

.gitea/actions/flux-deploy/action.yml

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+name: Flux GitOps Deploy
+description: Update a Flux HelmRelease image tag in a GitOps repo to trigger a Kubernetes deployment
+author: eric
+
+inputs:
+  image-repository:
+    description: Full image repository (e.g. git.ericxliu.me/eric/workout)
+    required: true
+  image-tag:
+    description: Image tag to deploy (e.g. 2026-06-17-abc1234)
+    required: true
+  gitops-repo:
+    description: SSH URL of the GitOps repo
+    default: git@github.com:eric-x-liu/k8s-flux.git
+    required: false
+  gitops-file:
+    description: Path to the release YAML in the GitOps repo (e.g. apps/myapp/workout/release.yaml)
+    required: true
+  deploy-key:
+    description: SSH private key with push access to the GitOps repo
+    required: true
+  git-user-name:
+    description: Git commit author name
+    default: gitops-ci
+    required: false
+  git-user-email:
+    description: Git commit author email
+    default: gitops-ci@users.noreply.git.ericxliu.me
+    required: false
+  commit-message:
+    description: "Custom commit message. Supports {app} and {tag} placeholders."
+    default: ""
+    required: false
+
+runs:
+  using: composite
+  steps:
+    - name: Update GitOps image tag
+      shell: bash
+      env:
+        IMAGE_REPOSITORY: ${{ inputs.image-repository }}
+        IMAGE_TAG: ${{ inputs.image-tag }}
+        GITOPS_REPO: ${{ inputs.gitops-repo }}
+        GITOPS_FILE: ${{ inputs.gitops-file }}
+        DEPLOY_KEY: ${{ inputs.deploy-key }}
+        GIT_USER_NAME: ${{ inputs.git-user-name }}
+        GIT_USER_EMAIL: ${{ inputs.git-user-email }}
+        COMMIT_MESSAGE: ${{ inputs.commit-message }}
+      run: |
+        set -euo pipefail
+
+        # ── SSH setup ──────────────────────────────────────────────
+        mkdir -p "$HOME/.ssh"
+        printf '%s\n' "$DEPLOY_KEY" > "$HOME/.ssh/flux_deploy_key"
+        chmod 600 "$HOME/.ssh/flux_deploy_key"
+        ssh-keyscan -H github.com >> "$HOME/.ssh/known_hosts" 2>/dev/null
+        export GIT_SSH_COMMAND="ssh -i $HOME/.ssh/flux_deploy_key -o IdentitiesOnly=yes -o StrictHostKeyChecking=yes"
+
+        # ── Clone GitOps repo ──────────────────────────────────────
+        workdir="$(mktemp -d)"
+        git clone "$GITOPS_REPO" "$workdir/gitops"
+        cd "$workdir/gitops"
+
+        # ── Update image repository + tag via regex ────────────────
+        python3 -c '
+        import os, pathlib, re
+
+        path      = pathlib.Path(os.environ["GITOPS_FILE"])
+        repo      = os.environ["IMAGE_REPOSITORY"]
+        tag       = os.environ["IMAGE_TAG"]
+
+        text = path.read_text()
+        text = re.sub(r"(repository:\s*)\S+", lambda m: m.group(1) + repo, text, count=1)
+        text = re.sub(r"(tag:\s*)\S+",        lambda m: m.group(1) + tag,  text, count=1)
+        path.write_text(text)
+        '
+
+        # ── Commit + push (idempotent) ────────────────────────────
+        if git diff --quiet -- "$GITOPS_FILE"; then
+          echo "✅ GitOps already points to $IMAGE_REPOSITORY:$IMAGE_TAG — nothing to do"
+          exit 0
+        fi
+
+        # Derive app name from the gitops file path for the default commit message
+        APP_NAME="$(basename "$(dirname "$GITOPS_FILE")")"
+
+        if [ -z "$COMMIT_MESSAGE" ]; then
+          COMMIT_MESSAGE="Update ${APP_NAME} image to ${IMAGE_TAG}"
+        else
+          COMMIT_MESSAGE="${COMMIT_MESSAGE//\{app\}/$APP_NAME}"
+          COMMIT_MESSAGE="${COMMIT_MESSAGE//\{tag\}/$IMAGE_TAG}"
+        fi
+
+        git config user.name  "$GIT_USER_NAME"
+        git config user.email "$GIT_USER_EMAIL"
+        git add "$GITOPS_FILE"
+        git commit -m "$COMMIT_MESSAGE"
+        git push origin main
+
+        echo "🚀 Pushed: $IMAGE_REPOSITORY:$IMAGE_TAG → $GITOPS_FILE"

README.md

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+# actions-k8s
+
+Reusable Gitea Actions for Kubernetes deployments via Flux GitOps.
+
+## actions/flux-deploy
+
+Composite action that updates a [Flux HelmRelease](https://fluxcd.io/flux/components/helm/) image tag in a GitOps repo to trigger a Kubernetes deployment.
+
+This action clones the GitOps repo, updates the `repository` and `tag` fields in the specified release YAML, commits, and pushes. If the release already points to the requested image, the action exits cleanly (idempotent).
+
+### Usage
+
+```yaml
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    needs: [ci]
+    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+    steps:
+      - name: Add SSH_KEY
+        run: |
+          echo "${{ secrets.SSH_KEY }}" > $HOME/.ssh/id_rsa
+          chmod 400 $HOME/.ssh/id_rsa
+          ssh-keyscan -H git.ericxliu.me > $HOME/.ssh/known_hosts
+
+      - name: Checkout code
+        uses: https://gitea.com/actions/checkout@v4
+        with:
+          ssh-key: ${{ secrets.SSH_KEY }}
+
+      - name: Build and push image
+        id: image
+        uses: https://git.ericxliu.me/eric/actions-docker/.gitea/actions/docker-build@main
+        with:
+          image-name: ${{ github.event.repository.name }}
+          push: true
+
+      - name: Deploy to K8s via Flux
+        uses: https://git.ericxliu.me/eric/actions-k8s/.gitea/actions/flux-deploy@main
+        with:
+          image-repository: ${{ github.server_url }}/${{ github.repository }}
+          image-tag: ${{ steps.image.outputs.tag }}
+          gitops-file: apps/myapp/my-app/release.yaml
+          deploy-key: ${{ secrets.K8S_FLUX_DEPLOY_KEY }}
+```
+
+### Inputs
+
+| Input | Required | Default | Description |
+|-------|----------|---------|-------------|
+| `image-repository` | **Yes** | — | Full image repository (e.g. `git.ericxliu.me/eric/workout`) |
+| `image-tag` | **Yes** | — | Image tag to deploy (e.g. `2026-06-17-abc1234`) |
+| `gitops-repo` | No | `git@github.com:eric-x-liu/k8s-flux.git` | SSH URL of the GitOps repo |
+| `gitops-file` | **Yes** | — | Path to release YAML in the GitOps repo |
+| `deploy-key` | **Yes** | — | SSH private key with push access to the GitOps repo |
+| `git-user-name` | No | `gitops-ci` | Git commit author name |
+| `git-user-email` | No | `gitops-ci@users.noreply.git.ericxliu.me` | Git commit author email |
+| `commit-message` | No | `Update {app} image to {tag}` | Custom commit message (`{app}` and `{tag}` are replaced) |
+
+### How It Works
+
+1. Sets up SSH with the provided deploy key
+2. Clones the GitOps repo (e.g. `k8s-flux`)
+3. Updates `repository:` and `tag:` fields in the specified release YAML via regex
+4. If no changes detected → exits cleanly (idempotent)
+5. Commits and pushes to trigger Flux reconciliation
+
+### Requirements
+
+- The GitOps repo must be accessible via SSH with the provided deploy key
+- The release YAML must contain `repository:` and `tag:` fields (standard bjw-s `app-template` chart format)
+- `python3` must be available on the runner (standard on `ubuntu-latest`)