From 9a9cd9d1d32f881c38129cf803626dea97999fdb Mon Sep 17 00:00:00 2001
From: Austin Schaefer <schaefer.austin.p@inbox.eu>
Date: Wed, 16 Sep 2026 15:22:30 +0200
Subject: [PATCH] Stop caching target/ and fix sccache's per-run cache key
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target/ was the majority of the ~1.5GB cache each of the 5 CI jobs
tarred and uploaded on every run — expensive on a single runner where
those uploads contend for the same disk/network, and pointless since
these jobs build different feature-set combinations into one
identically-keyed target dir anyway. sccache already gives compiler-
level reuse without that duplication.

sccache's cache key was keyed to github.run_id, which never gets an
exact hit, so its ~377MB also re-uploaded in full every single run
with no benefit. Key it to Cargo.lock like the registry cache instead,
so it only re-saves when dependencies actually change.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
---
 .forgejo/workflows/ci.yml | 22 +++++++++-------------
 1 file changed, 9 insertions(+), 13 deletions(-)

diff --git a/.forgejo/workflows/ci.yml b/.forgejo/workflows/ci.yml
index 7be5fc9..3774cde 100644
--- a/.forgejo/workflows/ci.yml
+++ b/.forgejo/workflows/ci.yml
@@ -24,7 +24,6 @@ jobs:
           path: |
             ~/.cargo/registry
             ~/.cargo/git
-            target
           key: cargo-${{ runner.os }}-${{ hashFiles('**/Cargo.lock') }}
           restore-keys: |
             cargo-${{ runner.os }}-
@@ -33,10 +32,11 @@ jobs:
         uses: actions/cache@v4
         with:
           path: /root/.cache/sccache
-          # Not keyed to Cargo.lock: sccache caches individual compiler
-          # invocations by content hash, so it should accumulate across
-          # dependency bumps rather than reset like the target/ cache above.
-          key: sccache-${{ runner.os }}-${{ github.run_id }}
+          # Keyed to Cargo.lock, not github.run_id: a per-run key never
+          # gets an exact hit, so actions/cache re-uploads the full
+          # sccache dir on every single run even when nothing changed.
+          # This still refreshes whenever dependencies bump.
+          key: sccache-${{ runner.os }}-${{ hashFiles('**/Cargo.lock') }}
           restore-keys: |
             sccache-${{ runner.os }}-
 
@@ -54,7 +54,6 @@ jobs:
           path: |
             ~/.cargo/registry
             ~/.cargo/git
-            target
           key: cargo-${{ runner.os }}-${{ hashFiles('**/Cargo.lock') }}
           restore-keys: |
             cargo-${{ runner.os }}-
@@ -63,7 +62,7 @@ jobs:
         uses: actions/cache@v4
         with:
           path: /root/.cache/sccache
-          key: sccache-${{ runner.os }}-${{ github.run_id }}
+          key: sccache-${{ runner.os }}-${{ hashFiles('**/Cargo.lock') }}
           restore-keys: |
             sccache-${{ runner.os }}-
 
@@ -81,7 +80,6 @@ jobs:
           path: |
             ~/.cargo/registry
             ~/.cargo/git
-            target
           key: cargo-${{ runner.os }}-${{ hashFiles('**/Cargo.lock') }}
           restore-keys: |
             cargo-${{ runner.os }}-
@@ -90,7 +88,7 @@ jobs:
         uses: actions/cache@v4
         with:
           path: /root/.cache/sccache
-          key: sccache-${{ runner.os }}-${{ github.run_id }}
+          key: sccache-${{ runner.os }}-${{ hashFiles('**/Cargo.lock') }}
           restore-keys: |
             sccache-${{ runner.os }}-
 
@@ -115,7 +113,6 @@ jobs:
           path: |
             ~/.cargo/registry
             ~/.cargo/git
-            target
           key: cargo-${{ runner.os }}-${{ hashFiles('**/Cargo.lock') }}
           restore-keys: |
             cargo-${{ runner.os }}-
@@ -124,7 +121,7 @@ jobs:
         uses: actions/cache@v4
         with:
           path: /root/.cache/sccache
-          key: sccache-${{ runner.os }}-${{ github.run_id }}
+          key: sccache-${{ runner.os }}-${{ hashFiles('**/Cargo.lock') }}
           restore-keys: |
             sccache-${{ runner.os }}-
 
@@ -143,7 +140,6 @@ jobs:
           path: |
             ~/.cargo/registry
             ~/.cargo/git
-            target
           key: cargo-${{ runner.os }}-${{ hashFiles('**/Cargo.lock') }}
           restore-keys: |
             cargo-${{ runner.os }}-
@@ -152,7 +148,7 @@ jobs:
         uses: actions/cache@v4
         with:
           path: /root/.cache/sccache
-          key: sccache-${{ runner.os }}-${{ github.run_id }}
+          key: sccache-${{ runner.os }}-${{ hashFiles('**/Cargo.lock') }}
           restore-keys: |
             sccache-${{ runner.os }}-