[PATCH 2/6] coverity: cache the Coverity Build Tool

["Johannes Schindelin via GitGitGadget" <gitgitgadget@xxxxxxxxx>]

From: Johannes Schindelin <johannes.schindelin@xxxxxx>

It would add a 1GB+ download for every run, better cache it.

This is inspired by the GitHub Action `vapier/coverity-scan-action`,
however, it uses the finer-grained `restore`/`save` method to be able to
cache the Coverity Build Tool even if an unrelated step in the GitHub
workflow fails later on.

Signed-off-by: Johannes Schindelin <johannes.schindelin@xxxxxx>
---
 .github/workflows/coverity.yml | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/.github/workflows/coverity.yml b/.github/workflows/coverity.yml
index 24408f6282c..e8d0be52702 100644
--- a/.github/workflows/coverity.yml
+++ b/.github/workflows/coverity.yml
@@ -29,16 +29,41 @@ jobs:
         env:
           runs_on_pool: ubuntu-latest
 
+      # The Coverity site says the tool is usually updated twice yearly, so the
+      # MD5 of download can be used to determine whether there's been an update.
+      - name: get the Coverity Build Tool hash
+        id: lookup
+        run: |
+          MD5=$(curl https://scan.coverity.com/download/$COVERITY_LANGUAGE/$COVERITY_PLATFORM \
+                   --data "token=${{ secrets.COVERITY_SCAN_TOKEN }}&project=$COVERITY_PROJECT&md5=1")
+          echo "hash=$MD5" >>$GITHUB_OUTPUT
+
+      # Try to cache the tool to avoid downloading 1GB+ on every run.
+      # A cache miss will add ~30s to create, but a cache hit will save minutes.
+      - name: restore the Coverity Build Tool
+        id: cache
+        uses: actions/cache/restore@v3
+        with:
+          path: ${{ runner.temp }}/cov-analysis
+          key: cov-build-${{ env.COVERITY_LANGUAGE }}-${{ env.COVERITY_PLATFORM }}-${{ steps.lookup.outputs.hash }}
       - name: download the Coverity Build Tool (${{ env.COVERITY_LANGUAGE }} / ${{ env.COVERITY_PLATFORM}})
+        if: steps.cache.outputs.cache-hit != 'true'
         run: |
           curl https://scan.coverity.com/download/$COVERITY_LANGUAGE/$COVERITY_PLATFORM \
             --no-progress-meter \
             --output $RUNNER_TEMP/cov-analysis.tgz \
             --data "token=${{ secrets.COVERITY_SCAN_TOKEN }}&project=$COVERITY_PROJECT"
       - name: extract the Coverity Build Tool
+        if: steps.cache.outputs.cache-hit != 'true'
         run: |
           mkdir $RUNNER_TEMP/cov-analysis &&
           tar -xzf $RUNNER_TEMP/cov-analysis.tgz --strip 1 -C $RUNNER_TEMP/cov-analysis
+      - name: cache the Coverity Build Tool
+        if: steps.cache.outputs.cache-hit != 'true'
+        uses: actions/cache/save@v3
+        with:
+          path: ${{ runner.temp }}/cov-analysis
+          key: cov-build-${{ env.COVERITY_LANGUAGE }}-${{ env.COVERITY_PLATFORM }}-${{ steps.lookup.outputs.hash }}
       - name: build with cov-build
         run: |
           export PATH="$RUNNER_TEMP/cov-analysis/bin:$PATH" &&
-- 
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