[ci]: fix failure (#348)

* install unversioned `llvm` so that it pulls the latest one.
* disable `uninitvar` check on cppcheck as it catches some false positives and
  gcc/clang/clang-tidy are good at catching uninitialized variables already.

Reviewed-on: https://codeberg.org/nsxiv/nsxiv/pulls/348
Reviewed-by: explosion-mental <explosion-mental@noreply.codeberg.org>

.woodpecker/analysis.yml

@@ -14,7 +14,7 @@ pipeline:
           --force --quiet --inline-suppr --error-exitcode=1 \
           --max-ctu-depth=8 -j"$(nproc)" \
           $(make OPT_DEP_DEFAULT="$1" dump_cppflags) \
-          --suppress=varFuncNullUB \
+          --suppress=varFuncNullUB --suppress=uninitvar \
           *.c
       }
       run_tidy() {

.woodpecker/build.yml

@@ -10,7 +10,7 @@ pipeline:
       apk add --no-cache \
           imlib2 imlib2-dev xorgproto \
           libxft libxft-dev libexif libexif-dev giflib giflib-dev libwebp libwebp-dev \
-          gcc clang llvm12 llvm12-dev build-base wget ca-certificates >/dev/null
+          gcc clang llvm llvm-dev build-base wget ca-certificates >/dev/null
       wget "https://github.com/TinyCC/tinycc/archive/$TCC_SHA.tar.gz" >/dev/null
       tar xzf "$TCC_SHA.tar.gz" >/dev/null
       ( cd "tinycc-$TCC_SHA" && ./configure --config-musl && make -s -j"$(nproc)" && make install; ) >/dev/null