ci: GitHub releng for release automation

.github/workflows/docker-push.yml

@@ -96,11 +96,6 @@ jobs:
         docker tag nix:$NIX_VERSION $IMAGE_ID:$NIX_VERSION
         docker push $IMAGE_ID:$NIX_VERSION
         if [ "$IS_MASTER" = "true" ]; then
-          # FIXME: Do not tag master as latest. Upload to GHCR as part of
-          # releng instead. Possibly adapt this reusable workflow for the (yet
-          # nonexistent) release workflow.
-          docker tag nix:$NIX_VERSION $IMAGE_ID:latest
           docker tag nix:$NIX_VERSION $IMAGE_ID:master
-          docker push $IMAGE_ID:latest
           docker push $IMAGE_ID:master
         fi

.github/workflows/upload-release.yml

@@ -0,0 +1,69 @@
+name: Upload Release
+on:
+  workflow_dispatch:
+    inputs:
+      eval_id:
+        description: "Hydra evaluation ID"
+        required: true
+        type: number
+      is_latest:
+        description: "Mark as latest release"
+        required: false
+        type: boolean
+        default: false
+permissions:
+  contents: read
+  id-token: write
+  packages: write
+jobs:
+  release:
+    runs-on: ubuntu-24.04
+    environment: releases
+    steps:
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+      - uses: ./.github/actions/install-nix-action
+        with:
+          dogfood: false # Use stable version
+          use_cache: false # Don't want any cache injection shenanigans
+          extra_nix_config: |
+            experimental-features = nix-command flakes
+      - name: Set NIX_PATH from flake input
+        run: |
+          NIXPKGS_PATH=$(nix build --inputs-from .# nixpkgs#path --print-out-paths --no-link)
+          # Shebangs with perl have issues. Pin nixpkgs this way. nix shell should maybe
+          # get the same uberhack that nix-shell has to support it.
+          echo "NIX_PATH=nixpkgs=$NIXPKGS_PATH" >> "$GITHUB_ENV"
+      - name: Configure AWS credentials
+        uses: aws-actions/configure-aws-credentials@61815dcd50bd041e203e49132bacad1fd04d2708 # v5.1.1
+        with:
+          role-to-assume: "arn:aws:iam::080433136561:role/nix-release"
+          role-session-name: nix-release-oidc-${{ github.run_id }}
+          aws-region: eu-west-1
+      - name: Login to Docker Hub
+        uses: docker/login-action@5e57cd118135c172c3672efd75eb46360885c0ef # v3.6.0
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@5e57cd118135c172c3672efd75eb46360885c0ef # v3.6.0
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Upload release
+        run: |
+          ./maintainers/upload-release.pl \
+            ${{ inputs.eval_id }} \
+            --skip-git
+        env:
+          IS_LATEST: ${{ inputs.is_latest && '1' || '' }}
+      - name: Push to GHCR
+        run: |
+          DOCKER_OWNER="ghcr.io/$(echo '${{ github.repository_owner }}' | tr '[A-Z]' '[a-z]')/nix"
+          ./maintainers/upload-release.pl \
+            ${{ inputs.eval_id }} \
+            --skip-git \
+            --skip-s3 \
+            --docker-owner "$DOCKER_OWNER"
+        env:
+          IS_LATEST: ${{ inputs.is_latest && '1' || '' }}

maintainers/keys/158A6F530EA202E5F651611314FAEA63448E1DF9.asc

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+DjO3EoutNGpuz6rZvc/BlymphWBoAdUmxgoObr7NYWgw9pI8WeE6C7bbSOO7p5aQ
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+3MYf6qfjjvE4HlDwZal8th7ccoQp/flfJIuRv85xCcKK+PI=
+=u5cX
+-----END PGP PUBLIC KEY BLOCK-----

maintainers/keys/README.md

@@ -0,0 +1,13 @@
+# Maintainer GPG Keys
+
+Release tags are signed by members of the [Nix maintainer team](https://nixos.org/community/teams/nix/) as part of the [release process](../release-process.md). This directory contains the public GPG keys used for signing.
+
+## Keys
+
+- **Eelco Dolstra**
+  GPG Fingerprint: `B541 D553 0127 0E0B CF15 CA5D 8170 B472 6D71 98DE`
+
+- **Sergei Zimmerman**
+  GPG Fingerprint: [`158A 6F53 0EA2 02E5 F651 6113 14FA EA63 448E 1DF9`](https://keys.openpgp.org/vks/v1/by-fingerprint/158A6F530EA202E5F651611314FAEA63448E1DF9)
+
+<!-- TODO: Add keys for other Nix team members -->

maintainers/release-process.md

@@ -5,11 +5,11 @@
 The release process is intended to create the following for each
 release:
 
-* A Git tag
+* A signed Git tag (public keys in `maintainers/keys/`)
 
 * Binary tarballs in https://releases.nixos.org/?prefix=nix/
 
-* Docker images
+* Docker images (arm64 and amd64 variants, uploaded to DockerHub and GHCR)
 
 * Closures in https://cache.nixos.org
 
@@ -104,21 +104,17 @@ release:
   evaluation ID (e.g. `1780832` in
   `https://hydra.nixos.org/eval/1780832`).
 
-* Tag the release and upload the release artifacts to
-  [`releases.nixos.org`](https://releases.nixos.org/) and [Docker Hub](https://hub.docker.com/):
+* Tag the release:
 
   ```console
-  $ IS_LATEST=1 ./maintainers/upload-release.pl <EVAL-ID>
+  $ IS_LATEST=1 ./maintainers/upload-release.pl --skip-docker --skip-s3 --project-root $PWD <EVAL-ID>
   ```
 
   Note: `IS_LATEST=1` causes the `latest-release` branch to be
   force-updated. This is used by the `nixos.org` website to get the
   [latest Nix manual](https://nixos.org/manual/nixpkgs/unstable/).
 
-  TODO: This script requires the right AWS credentials. Document.
-
-  TODO: This script currently requires a
-  `/home/eelco/Dev/nix-pristine`.
+* Trigger the [`upload-release.yml` workflow](https://github.com/NixOS/nix/actions/workflows/upload-release.yml) via `workflow_dispatch` trigger. At the top click `Run workflow` -> select the current release branch from `Use workflow from` -> fill in `Hydra evaluation ID` with `<EVAL-ID>` value from previous steps -> click `Run workflow`. Wait for the run to be approved by `NixOS/nix-team` (or bypass checks if warranted). Wait for the workflow to succeed.
 
   TODO: trigger nixos.org netlify: https://docs.netlify.com/configure-builds/build-hooks/
 
@@ -181,16 +177,18 @@ release:
 * Wait for the desired evaluation of the maintenance jobset to finish
   building.
 
-* Run
+* Tag the release
 
   ```console
-  $ IS_LATEST=1 ./maintainers/upload-release.pl <EVAL-ID>
+  $ IS_LATEST=1 ./maintainers/upload-release.pl --skip-docker --skip-s3 --project-root $PWD <EVAL-ID>
   ```
 
   Omit `IS_LATEST=1` when creating a point release that is not on the
   most recent stable branch. This prevents `nixos.org` to going back
   to an older release.
 
+* Trigger the [`upload-release.yml` workflow](https://github.com/NixOS/nix/actions/workflows/upload-release.yml) via `workflow_dispatch` trigger. At the top click `Run workflow` -> select the current release branch from `Use workflow from` -> fill in `Hydra evaluation ID` with `<EVAL-ID>` value from previous steps -> click `Run workflow`. Wait for the run to be approved by `NixOS/nix-team` (or bypass checks if warranted). Wait for the workflow to succeed.
+
 * Bump the version number of the release branch as above (e.g. to
   `2.12.2`).