downgraded rust version: cosmwasm-std 1.5.2 is incompatible with rust…

… 1.78+

.github/workflows/build.yml

@@ -11,7 +11,7 @@ on:
     inputs:
       toolchain:
         description: 'Default Rust Toolchain'
-        default: "1.78.0"
+        default: "1.75.0"
         required: true
         type: string
       target:
@@ -31,7 +31,7 @@ on:
         type: string
 
 env:
-  TOOLCHAIN: ${{ inputs.toolchain || '1.78.0' }}
+  TOOLCHAIN: ${{ inputs.toolchain || '1.75.0' }}
   TARGET: ${{ inputs.target || 'wasm32-unknown-unknown' }}
   REF: ${{ github.event_name == 'push' && github.ref || inputs.branch || 'main' }}
   ID: ${{ inputs.id || 'scheduled' }}

.github/workflows/tests.yml

@@ -15,7 +15,7 @@ jobs:
           fetch-depth: 1
       - uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: 1.78.0
+          toolchain: 1.75.0
           components: clippy
           profile: minimal
           override: true
@@ -31,7 +31,7 @@ jobs:
           fetch-depth: 1
       - uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: 1.78.0
+          toolchain: 1.75.0
           components: rustfmt
           profile: minimal
           override: true
@@ -49,7 +49,7 @@ jobs:
           fetch-depth: 1
       - uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: 1.78.0
+          toolchain: 1.75.0
           profile: minimal
       - run: cargo fetch --verbose
       - run: cargo build

Makefile

@@ -21,6 +21,6 @@ compile:
 	    --mount type=volume,source="$(notdir $(CURDIR))_cache",target=/target \
 	    --mount type=volume,source=registry_cache,target=/usr/local/cargo/registry \
 	    --platform linux/amd64 \
-	    cosmwasm/workspace-optimizer:0.16.0
+	    cosmwasm/workspace-optimizer:0.15.1
 
 build: schema clippy fmt test compile check_contracts

rust-toolchain.toml

@@ -1,2 +1,2 @@
 [toolchain]
-channel = "1.78.0"
+channel = "1.75.0"