Add script for generating This Month in Nix Docs

maintainers/this-month-in-nix-docs/README.md

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+# This Month in Nix Docs
+This is a script and template for compiling "This Month in Nix Docs". The process is semi-automated. The script queries a collection of Nix repositories, looking for merged PRs with documentation-related labels, RFCs (you have to look through these manually), and tracking issues in this repository.
+
+A new post is created via:
+```
+$ ./new-post.sh <from YYYY-MM-DD> <to YYYY-MM-DD> >new-post.md
+```
+
+After this invocation a template post (`new-post.md`) will be filled out with the GitHub query results formatted as markdown at the end of the file. You'll also need to fill in the number and year/month at the top of the post.

maintainers/this-month-in-nix-docs/make-post.sh

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+#! /usr/bin/env nix-shell
+#! nix-shell -i bash -p gh
+
+set -euo pipefail
+
+if [ $# -eq 0 ]; then
+    echo "Usage: query-prs.sh <from YYYY-MM-DD> <to YYYY-MM-DD>"
+    exit 1
+fi
+
+from_date="$1"
+to_date="$2"
+pr_fields="number,title,author,url"
+pr_template="{{range .}}- [#{{.number}}]({{.url}}) {{.title}} ([@{{.author.login}}](https://github.com/{{.author.login}})){{printf \"\n\"}}{{end}}"
+tracking_issue_template="{{range .}}- [#{{.number}}]({{.url}}) {{.title}}{{printf \"\n\"}}{{end}}"
+
+# Lists the PRs merged from a repository between certain dates, optionally filtered by labels
+list_merged_prs() {
+    if [ $# -gt 1 ]; then
+        repo="$1"
+        labels="$2"
+        gh pr list -R "$repo" --search "is:merged merged:$from_date..$to_date label:\"$labels\"" --json "$pr_fields" --template "$pr_template"
+    else
+        repo="$1"
+        gh pr list -R "$repo" --search "is:merged merged:$from_date..$to_date" --json "$pr_fields" --template "$pr_template"
+    fi
+}
+
+# Lists the PRs opened on a repository
+list_opened_prs() {
+    if [ $# -gt 1 ]; then
+        repo="$1"
+        labels="$2"
+        gh pr list -R "$repo" --search "is:unmerged created:$from_date..$to_date label:\"$labels\"" --json "$pr_fields" --template "$pr_template"
+    else
+        repo="$1"
+        gh pr list -R "$repo" --search "is:unmerged created:$from_date..$to_date" --json "$pr_fields" --template "$pr_template"
+    fi
+}
+
+# Lists all of the tracking issues opened on nix.dev within the specified dates
+list_new_tracking_issues() {
+    gh issue list -R "nixos/nix.dev" --search "created:$from_date..$to_date label:tracking" --json "$pr_fields" --template "$tracking_issue_template"
+}
+
+cat template.md
+
+echo "## PRs"
+echo
+
+echo "### NixOS/nix"
+list_merged_prs "nixos/nix" "documentation"
+echo
+
+echo "### NixOS/nixpkgs"
+list_merged_prs "nixos/nixpkgs" "6.topic: documentation"
+echo
+
+echo "### NixOS/nix-pills"
+list_merged_prs "nixos/nix-pills"
+echo
+
+echo "### NixOS/nix.dev"
+list_merged_prs "nixos/nix.dev"
+echo
+
+echo "## RFCs"
+echo
+
+echo "### Opened (manually check for relevance)"
+list_opened_prs "nixos/rfcs"
+echo
+
+echo "### Accepted (manually check for relevance)"
+list_merged_prs "nixos/rfcs"
+echo
+
+echo "## New Tracking Issues"
+list_new_tracking_issues
+echo

maintainers/this-month-in-nix-docs/template.md

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+# This Month in Nix Docs - #**NUMBER** - **MONTH** **YEAR**
+
+## Community
+You can always find the Documentation Team on Matrix: [Nix Documentation](https://matrix.to/#/#docs:nixos.org). Drop in if you'd like to contribute!
+
+## Projects
+
+## RFCs
+
+## Documentation PRs Merged
+
+# AUTOGENERATED