ci: run Forgejo Actions & Packages test w/ dynamic matrix (#1367)

Incorporates these changes:
- When `forgejo/build-from-sources` is present, Actions & Packages tests are run only against the built versions.  Otherwise, they are run against the versions defined in `$RELEASE_NUMBERS`
- Updates Packages tests which are testing Alpine publishing to use currently supported Alpine releases
- Actions & Packages tests are run in a matrix, allowing parallel execution

Only the Actions & Packages tests take a significant amount of time (>10 minutes), so changes have been limited to those test suites -- every test suite that is moved into a matrix adds additional overhead in the 1 minute `prepare-end-to-end` step.

Reviewed-on: https://code.forgejo.org/forgejo/end-to-end/pulls/1367
Co-authored-by: Mathieu Fenniak <mathieu@fenniak.net>
Co-committed-by: Mathieu Fenniak <mathieu@fenniak.net>

packages/alpine-10.0

@@ -1 +0,0 @@
-alpine-7.0

packages/alpine.sh

@@ -7,7 +7,7 @@ function test_packages_alpine_version() {
     reset_forgejo $PACKAGES_DIR/alpine-app.ini
     start_forgejo $forgejo_version
 
-    local d=$PACKAGES_DIR/alpine-$forgejo_version
+    local d=$PACKAGES_DIR/alpine
     local token=$(cat $DIR/forgejo-curl/token)
     local url=http://${HOST_PORT}
 
@@ -16,8 +16,10 @@ function test_packages_alpine_version() {
 }
 
 function test_packages_alpine() {
-    for alpine_version in 3.20 3.21; do
-        for forgejo_version in 7.0 10.0; do
+    local forgejo_versions="${1:-$RELEASE_NUMBERS}"
+
+    for alpine_version in 3.22 3.23; do
+        for forgejo_version in $forgejo_versions; do
             test_packages_alpine_version $alpine_version $forgejo_version
         done
     done

packages/packages.sh

@@ -7,5 +7,7 @@ PACKAGES_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 source $PACKAGES_DIR/alpine.sh
 
 function test_packages() {
-    run test_packages_alpine
+    local forgejo_versions="${1:-$RELEASE_NUMBERS}"
+
+    run test_packages_alpine $forgejo_versions
 }