Add Gitea Actions workflow to auto-provision Coder templates

.gitea/workflows/coder-templates.yml pushes every templates/<env>/ dir
to Coder as profiles-<env> on every push to main that touches
templates/**, scripts/**, or profile-templates/** - coder templates push
creates the template on first run and updates it thereafter, so adding a
new templates/<env>/ directory is enough to provision it, no workflow
edits needed.

It also diffs templates/ against the previous commit and runs
`coder templates delete profiles-<env>` for any directory that was
removed. Deletion fails (loudly, as a job warning, not a hard failure)
rather than succeeding if the template still has active workspaces,
since coder templates delete already refuses that server-side.

Runs on the ubuntu-latest self-hosted Gitea runner already registered on
this instance (confirmed via gitea-runner-1's /data/.runner labels) and
installs the coder CLI itself. Needs CODER_URL and CODER_SESSION_TOKEN
as repo/org Actions secrets - documented in README, left for the user to
set up since token creation needs their own Coder login.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

.gitea/workflows/coder-templates.yml

@@ -0,0 +1,80 @@
+name: Provision Coder Templates
+
+# Keeps Coder templates in sync with templates/*/ in this repo:
+#   - every push to main pushes a new version of each templates/<env>/ dir
+#     (coder templates push creates it if it doesn't exist yet, so adding a
+#     new templates/<env>/ directory is enough to provision a new one)
+#   - if a templates/<env>/ directory is removed on main, its template is
+#     deleted from Coder. `coder templates delete` refuses to delete a
+#     template that still has active workspaces, so this can't silently
+#     orphan running workspaces - it just fails loudly and needs a human.
+#
+# Requires two repo/org secrets (Settings > Actions > Secrets):
+#   CODER_URL             e.g. https://code.octoturge.com
+#   CODER_SESSION_TOKEN   a token from `coder tokens create`, ideally under a
+#                          dedicated service account rather than a personal one
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - "templates/**"
+      - "scripts/**"
+      - "profile-templates/**"
+      - ".gitea/workflows/coder-templates.yml"
+  workflow_dispatch: {}
+
+jobs:
+  provision:
+    runs-on: ubuntu-latest
+    env:
+      CODER_URL: ${{ secrets.CODER_URL }}
+      CODER_SESSION_TOKEN: ${{ secrets.CODER_SESSION_TOKEN }}
+    steps:
+      - name: Checkout (full history, needed to detect removed templates)
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Install coder CLI
+        run: |
+          set -e
+          curl -fsSL https://coder.com/install.sh | sh
+          coder version
+
+      - name: Push (create or update) every template
+        run: |
+          set -e
+          for dir in templates/*/; do
+            name="profiles-$(basename "$dir")"
+            echo "::group::Pushing $name from $dir"
+            coder templates push "$name" -d "$dir" --yes \
+              -m "auto-provisioned from ${GITHUB_SHA:0:12}"
+            echo "::endgroup::"
+          done
+
+      - name: Delete templates whose directory was removed
+        if: github.event_name == 'push'
+        run: |
+          set -e
+          PREV_SHA="$(git rev-parse HEAD~1 2>/dev/null || true)"
+          if [ -z "$PREV_SHA" ]; then
+            echo "No previous commit on this branch (first push), nothing to diff. Skipping."
+            exit 0
+          fi
+
+          OLD_DIRS="$(git ls-tree -d --name-only "$PREV_SHA" -- templates 2>/dev/null | xargs -n1 basename 2>/dev/null || true)"
+          if [ -z "$OLD_DIRS" ]; then
+            echo "No templates/ directory at $PREV_SHA, nothing to diff. Skipping."
+            exit 0
+          fi
+
+          for old in $OLD_DIRS; do
+            if [ ! -d "templates/$old" ]; then
+              name="profiles-$old"
+              echo "::group::Deleting $name (templates/$old was removed)"
+              coder templates delete "$name" --yes \
+                || echo "::warning::Failed to delete $name - check for active workspaces still using it."
+              echo "::endgroup::"
+            fi
+          done