Initial HTTP/3 and QPACK implementationHEADqpackmaster

Cowlib now uses GitHub Actions for CI. As a result
of this change, Cowlib is tested against OTP-24+.

This commit adds initial implementations of
cow_http3, cow_http3_machine and cow_qpack.

Because QPACK is similar to HPACK, some encoding and
decoding functions were moved to a common include file,
particularly the huffman functions.

The cow_http module now contains the types and functions
common to all or most versions of HTTP. The types and
functions specific to HTTP/1 were moved to the new
cow_http1 module.

Because HTTP/3 is similar to HTTP/2, part of the code
processing headers is common and can be found in
cow_http. Other functions common to both versions
were moved out of cow_http2_machine.

This commit updates comments indicating that the HTTP/2
PRIORITY mechanism will no longer be implemented.

1 files changed, 70 insertions, 0 deletions

diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
new file mode 100644
index 0000000..57a2cb1
--- /dev/null
+++ b/.github/workflows/ci.yaml
@@ -0,0 +1,70 @@
+## Use workflows from ninenines/ci.erlang.mk to test Cowlib.
+
+name: Check Cowlib
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+  schedule:
+      ## Every Monday at 2am.
+      - cron: 0 2 * * 1
+
+env:
+  CI_ERLANG_MK: 1
+
+jobs:
+  cleanup-master:
+    name: Cleanup master build
+    runs-on: ubuntu-latest
+    steps:
+
+    - name: Cleanup master build if necessary
+      if: ${{ github.event_name == 'schedule' }}
+      run: |
+        gh extension install actions/gh-actions-cache
+        gh actions-cache delete Linux-X64-Erlang-master -R $REPO --confirm || true
+        gh actions-cache delete macOS-X64-Erlang-master -R $REPO --confirm || true
+      env:
+        GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        REPO: ${{ github.repository }}
+
+  check:
+    name: Cowlib
+    needs: cleanup-master
+    uses: ninenines/ci.erlang.mk/.github/workflows/ci.yaml@master
+
+# The perfs tests are nice to run but typically not
+# important. So we run them after we are done with the other
+# test suites. At this point we know that Erlang was built
+# so we can just use the latest version.
+
+  perfs:
+    name: Run performance tests
+    needs: check
+    runs-on: 'ubuntu-latest'
+    if: ${{ !cancelled() }}
+    steps:
+
+    - name: Checkout repository
+      uses: actions/checkout@v4
+
+    - name: Output latest Erlang/OTP version
+      id: latest_version
+      run: |
+        {
+          echo "latest<<EOF"
+          make ci-list | grep -v rc | grep -v master | tail -n1
+          echo EOF
+        } >> "$GITHUB_OUTPUT"
+
+    - name: Restore CI cache
+      uses: actions/cache/restore@v4
+      with:
+        path: |
+          ~/erlang/
+        key: ${{ runner.os }}-${{ runner.arch }}-Erlang-${{ steps.latest_version.outputs.latest }}
+
+    - name: Run perfs
+      run: make perfs LATEST_ERLANG_OTP=1