meta: add cache to ci jobs

.gitlab-ci.yml

@@ -4,6 +4,9 @@ workflow:
 
 build-x86_64: &build
   image: registry.git.ptrc.gay/ptrcnull/ptrcports-builder/x86_64:latest
+  cache:
+    key: repodest-x86_64
+    paths: [repodest/]
   stage: build
   script:
     - setup-ssh-key "$PRIVATE_KEY"
@@ -23,28 +26,49 @@ build-x86_64: &build
 
 build-aarch64:
   <<: *build
+  cache:
+    key: repodest-aarch64
+    paths: [repodest/]
   image: registry.git.ptrc.gay/ptrcnull/ptrcports-builder/arm64v8:latest
 
 # build-armhf:
 #   <<: *build
+#   cache:
+#     key: repodest-armhf
+#     paths: [repodest/]
 #   image: arm32v6/alpine:edge
 
 # build-armv7:
 #   <<: *build
+#   cache:
+#     key: repodest-armv7
+#     paths: [repodest/]
 #   image: arm32v7/alpine:edge
 
 # build-ppc64le:
 #   <<: *build
+#   cache:
+#     key: repodest-ppc64le
+#     paths: [repodest/]
 #   image: ppc64le/alpine:edge
 
 # build-riscv64:
 #   <<: *build
+#   cache:
+#     key: repodest-riscv64
+#     paths: [repodest/]
 #   image: riscv64/alpine:edge
 
 # build-s390x:
 #   <<: *build
+#   cache:
+#     key: repodest-s390x
+#     paths: [repodest/]
 #   image: s390x/alpine:edge
 
 # build-x86:
 #   <<: *build
+#   cache:
+#     key: repodest-x86
+#     paths: [repodest/]
 #   image: i386/alpine:edge