ci: pin the last four linters instead of trusting the runner

prettier, ruff, yamllint and hadolint were the only CI tools still called bare,
straight off whatever the runner happened to have installed. Pin them in
tool-versions.env like the other three and install them the same way, so the
versions Renovate moves are the versions CI runs.

Each pinned version equals what is already on the runner, so this changes what
CI does not at all today. It changes what CI does on a rebuilt runner: the
pinned one gets installed over the drift.

The four need four different mechanisms, which is why this is not one pattern:

  hadolint  a bare binary per platform, like actionlint
  ruff,
  yamllint  PyPI wheels, unpacked by uv
  prettier  an npm tarball, unpacked by tar

prettier is the awkward one. Its entry point requires ../package.json relative
to its own real path, so copying the single file out -- which is what every
other installer here does -- yields a module-not-found at the first run. It
keeps its package directory in a versioned one next to a relative symlink, and
the tarball ships bin/ without the exec bit, so that needs chmod too.

hadolint's release names one platform uname-style and the other Go-style
(x86_64 but arm64), which 404s on the first architecture if you assume
otherwise.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.gitea/workflows/ci.yaml

@@ -106,6 +106,10 @@ jobs:
       - name: Check formatting with Prettier
         shell: bash
         run: |
+          set -euo pipefail
+          tools_dir="$(bash .gitea/workflows/install-ci-tools.sh prettier)"
+          export PATH="$tools_dir:$PATH"
+
           mapfile -t prettier_files < <(
             git ls-files \
               | grep -E '\.(md|json|ya?ml|html|css)$' \
@@ -126,14 +130,13 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4
 
-      - name: Lint Python with Ruff
+      - name: Lint and format-check Python with Ruff
         shell: bash
         run: |
+          set -euo pipefail
+          tools_dir="$(bash .gitea/workflows/install-ci-tools.sh ruff)"
+          export PATH="$tools_dir:$PATH"
           ruff check .
-
-      - name: Check Python formatting with Ruff
-        shell: bash
-        run: |
           ruff format --check .
 
   lint-yaml:
@@ -146,6 +149,10 @@ jobs:
       - name: Lint YAML syntax
         shell: bash
         run: |
+          set -euo pipefail
+          tools_dir="$(bash .gitea/workflows/install-ci-tools.sh yamllint)"
+          export PATH="$tools_dir:$PATH"
+
           mapfile -t yaml_files < <(
             git ls-files '*.yaml' '*.yml' \
               ':!node_modules/**' \
@@ -169,6 +176,10 @@ jobs:
       - name: Lint Dockerfiles
         shell: bash
         run: |
+          set -euo pipefail
+          tools_dir="$(bash .gitea/workflows/install-ci-tools.sh hadolint)"
+          export PATH="$tools_dir:$PATH"
+
           mapfile -t dockerfiles < <(
             git ls-files ':(glob)**/Dockerfile' ':(glob)**/Dockerfile.*'
           )